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Wood Grenade vs Twist Splitting Wedge

Updated: 15 October 2026

You are splitting a garden round for the stove, and amazon.co.uk is showing two Roughneck shapes beside a plain taper. One is a diamond wood grenade. The other is a twisted wedge. This wood grenade vs twist splitting wedge page tells you when the grenade's point should stand on the end grain, and when the twist is the better bet on a large or stringy round. The Products Compared editorial team set the Roughneck 65-504 beside the Roughneck 65-510 in our [splitting wedge comparison](/hub/forestry-tools/splitting-wedge). No splitting test was run. A qualifying purchase through our links can earn a commission at no extra cost to you. Profile, mass and steel are ordered in the [splitting wedge buying guide](/hub/forestry-tools/splitting-wedge/sub/splitting-wedge-buying-guide).

You are splitting a garden round for the stove, and amazon.co.uk is showing two Roughneck shapes beside a plain taper. One is a diamond wood grenade. The other is a twisted wedge.

Our top picks

Rolson Rolson 10780 diamond log splitter

Best overall

Rolson Rolson 10780 diamond log splitter
7.8/10about £7.94
View offer
Roughneck Roughneck wood grenade 65-504

Rank 2

Roughneck Roughneck wood grenade 65-504
8.1/10about £13.99
View offer
Roughneck Roughneck twister 65-510

Alternative

Roughneck Roughneck twister 65-510
5.4/10about £16.65
View offer
On this page
  1. 1.What each listing claims
  2. 2.What the reviews did
  3. 3.When to pick which
  4. 4.What this page will not call a four-way

What each listing claims

Roughneck's grenade page sells the 65-504 as a four-way wedge in manganese steel, at 1.6 kg, with a sharp tip and anti-pop notches. The amazon.co.uk listing for the wood grenade gives a diamond section, a spherical striking face and a sharp point, and the bullets leave out four-way. Item weight is 1.46 kg, the blade field says high carbon steel, and this file shows £13.99 with 4.3 from 1,490 reviews. Roughneck's twister page offers twist-and-split for larger logs, drop forged, hardened and tempered, at 2.3 kg. The amazon.co.uk title on the twister listing also says 2.3 kg, a bullet says it splits a log into two, and a display-weight field says 993 g. In this file it is £16.65, rated 4.3 from 154 reviews.

What the reviews did

UK reviews on the grenade describe a two-way split, plus rebound, jamming, and a tip that can break. Twister reviews praise the 65-510 on large knotty rounds once it is moving, and they call the edge hard to start. Amazon.co.uk reviewers mention a club hammer to start and a sledge to drive. One wedge broke into four pieces under a 4.5 lb lump hammer, which records the steel failing. Both listings score 4.3, so the comments do the choosing.
Rolson Rolson 10780 diamond log splitter

Testsieger

Rolson Rolson 10780 diamond log splitter
7.8/10about £7.94
View offer

When to pick which

Choose the grenade when you want a point on end grain and you can live with a two-way split. On a medium, fairly straight round, the £13.99 65-504 is the clearer buy, compared with the twister, because the hard-start complaint sits on the twist. Choose the twist for a large or stringy round if you can start a blunt oblique edge. The 65-510 is the better bet then, compared with the grenade, though the spiral waits until the chisel has bitten. Own both only when a second wedge is already the plan. Freeing a stuck wedge is covered on the splitting knotty hardwood page. The wider shortlist is on best splitting wedge.

What this page will not call a four-way

A powered splitter with a four-way wing is a different machine. HSE's firewood-processor bulletin uses BS EN 609-1 for powered wedge splitters, so a hand wedge you strike sits outside that standard. A log processor's wing is the piece that can quarter a round in one push, and the two-way comments on B00002N801 stay with the grenade. Reading the grenade as a guaranteed quarter would copy the shop line past those reviews. For one clean split from a plain taper, go back to the main comparison.

Common questions

Does the grenade quarter a log?
Roughneck's grenade page claims a four-way split, and the amazon.co.uk bullets for B00002N801 describe a diamond section and a sharp point without that claim. UK reviews in this file say the wood splits into two, and they mention rebound, jamming and a tip that can break. Plan on a two-way opening from the £13.99 wedge, and treat four sticks as a hope.
Which wedge suits a large knotty round?
The twist is the better bet for a large knotty or stringy round, if you can start the chisel edge. Roughneck sells the 65-510 for larger logs, and UK comments describe it on knotty wood with a sledge once it is moving. Makers of diamond wedges often call that shape a poor match for knotty hardwood, so the grenade is the weaker choice on that round. A hard face in the middle of the log is a poor place to start the twist.
Why does Roughneck say 1.6 kg when Amazon says 1.46 kg?
Roughneck's grenade page prints 1.6 kg and the amazon.co.uk item-weight field for B00002N801 prints 1.46 kg. A midpoint of those figures appears on neither listing, so they stay side by side. The twister has a wider clash: the title says 2.3 kg and a display-weight field says 993 g. Choose by shape until the kilogram fields agree. The £13.99 and £16.65 figures are the shelf prices in these files.
Does the twister split a log into two or four?
The twister's amazon.co.uk bullet says it splits a log into two. Roughneck's page describes twist-and-split for larger logs, which is a two-way job on strong wood. One review says the wedge broke into four pieces under a 4.5 lb lump hammer, and that line is the tool failing. Four sticks from one blow are a separate hope from buying the 65-510.
Can the grenade start and the twister finish?
You can use the grenade to start and the twister to finish when a second wedge is already the plan for a large round. A short grenade that opens the split, then a twist driven in behind it, matches the maul-pairing comments and the notes that keep the 65-510 as a follower. On a small, straight round, one wedge that stands up is enough. Skip the pair if a stuck wedge is already more than you can control.
Is a powered four-way wedge the same tool?
A powered four-way wedge is a machine part, and neither Roughneck here is that part. BS EN 609-1, as HSE uses it for firewood processors, covers powered splitters. The grenade and the twister are hand tools you strike. A machine wing that quarters a round leaves Roughneck's four-way line unproven on the wood grenade, and it leaves the twister's two-way bullet as written. For a processor, read the machine's own standard.

Related pages

How to use a splitting wedge

Stuck splitting wedge

Splitting wedge listing weight

Splitting wedges

Best Splitting Wedge: UK Review Counts and Profiles

Splitting Wedge Buying Guide: Profile, Mass, Steel

Splitting Knotty Hardwood When the First Wedge Sticks

Sources

Public UK and manufacturer sources used for this comparison; last accessed 15 October 2026.

  1. HSE: Using the right type of PPE (retrieved 15 October 2026)
  2. HSE: Firewood processing machines (retrieved 15 October 2026)
  3. Provision and Use of Work Equipment Regulations 1998 (retrieved 15 October 2026)
  4. Consumer Rights Act 2015 (retrieved 15 October 2026)
  5. GOV.UK: Selling wood for domestic use in England (retrieved 15 October 2026)
  6. Roughneck: Wood Grenade Splitting Wedge (retrieved 15 October 2026)
  7. Roughneck: Wood Twister Splitting Wedge (retrieved 15 October 2026)
  8. Bahco: Traditional steel splitting wedges (retrieved 15 October 2026)