Inch/Axle Wrench

Name: Inch/Axle Wrench
Brand: Arm Assassin
Rating: 4.89 (3 reviews)

The Inch/Axle Wrench is Arm Assassin Strength Shop’s grip-training tool for lifting a thick-diameter handle rather than rolling it, built around a fixed diameter (either 2” or 2 3/8”, picked at checkout) rather than a freely spinning barrel, so the resistance comes from the handle’s circumference rather than momentum – reviewers who bought it to train toward the Inch Dumbbell and King Kong call it a very challenging grip implement that “really wants to rip out of your hand.” Grip-strength authority Jedd Johnson (DieselCrew) has returned to it in training content across multiple years, cycling wrist flexion, neutral, and extension postures to build the specific rotational strength those thick-handle lifts demand.

At $45 for the single-hand version, it’s a purpose-built niche tool: not for general forearm work, but for lifters and armwrestlers specifically chasing thick-bar and rotational grip strength. GymRadar’s three reviewers rate it 4.89/5, calling out a chalk-friendly grip surface and build quality in line with Arm Assassin’s broader reputation among armwrestlers for competition-grade, made-to-order equipment.

Primary use	Thick-handle / rotational grip training (e.g. training toward the Inch Dumbbell, King Kong)
Manufacturer	Arm Assassin Strength Shop
Resistance type	Circumference-based (fixed-diameter handle, not a freely rolling barrel)
Texture options	Standard grip tape or bare (no grip tape)
Diameter options	2" (51mm) or 2 3/8" (60mm), sold as a single wrench -- pick one at checkout
Two hand variant	Double Inch and Axle Wrench ($80) -- separate SKU, works both wrists at once
Connection options	D ring or 3-hole bar

How it compares

	Inch/Axle Wrench	Grip Genie Grippers	Golden Grip Hand Grippers	Vertical Cannon (hilt/jug)
GymRadar rating	4.89/5	4.89/5	4.89/5	4.87/5
Price	$45.00	$130.00		$20.00
Primary use	Thick-handle / rotational grip training (e.g. training toward the Inch Dumbbell, King Kong)
Manufacturer	Arm Assassin Strength Shop
Resistance type	Circumference-based (fixed-diameter handle, not a freely rolling barrel)
Texture options	Standard grip tape or bare (no grip tape)
Diameter options	2" (51mm) or 2 3/8" (60mm), sold as a single wrench -- pick one at checkout
Two hand variant	Double Inch and Axle Wrench ($80) -- separate SKU, works both wrists at once
Connection options	D ring or 3-hole bar

4.9/5 · 3 GymRadar reviews

Reviews by source

Expert	4.89/5	3 reviews
Youtube	4.5/5	2 reviews
Reddit	4.2/5	1 reviews

The Inch/Axle Wrench earns strong marks from the niche audience that actually trains with one: GymRadar’s three reviewers rate it 4.89/5, praising its chalk-friendly grip surface and rotational resistance that reviewers say rivals lifting the Inch Dumbbell itself. Grip-strength authority Jedd Johnson (DieselCrew) has built repeat training content around it since 2021, cycling through flexion, neutral, and extension wrist postures to train toward the Inch Dumbbell and King Kong lifts. Build quality and value are the standout dimensions here; durability is the weakest, since no independent source has reported on long-term wear.

+Functionality: circumference-based resistance closely replicates the rotational demand of lifting the Inch Dumbbell, per GymRadar reviewers training toward that lift and King Kong (GymRadar)
+Build quality: reviewers call it well made with a chalk-friendly grip surface, consistent with Arm Assassin's reputation for competition-grade gear (GymRadar, r/armwrestling)
+Value: rated 5.00/5 on GymRadar's value dimension at a $45 price point (GymRadar)
+Versatility: trainable through flexion, neutral, and extension wrist postures, and used for both isolated wrist strength drills and armwrestling-specific side-pressure work (YouTube: Jedd Johnson / DieselCrew)

−Durability: no independent source reports on long-term wear or failure
−Value: one r/armwrestling commenter flagged Arm Assassin's direct pricing as high next to eBay/Amazon/AliExpress alternatives, though no cheaper source for this exact SKU turned up (r/armwrestling)
−Functionality: the GymRadar sample is small (3 reviews), so the 4.89 aggregate carries limited statistical weight (GymRadar)

$45.00

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