ARC Speed Knobs

Name: ARC Speed Knobs
Brand: Mutant Metals
Rating: 5.0 (5 reviews)

ARC Speed Knobs are a small hand-tightening accessory for Mutant Metals’ ARC cable-attachment system: a grooved, 3D-printed knob built around an embedded stainless-steel nut that lets you thread compatible handles or ARC Hand Bolts on and off by hand, with no wrench needed. They’re sold in pairs with plastic washers included, in two thread sizes – 1-8 and 5/8-11 – and a range of color options. GymRadar’s five owner reviews are unanimous, calling them lightweight, easy to use, and well built for the price. They’re only compatible with the ARC system or Mutant Metals’ own handles, and newer Rogue x Mutant Metals ARC builds thread handles directly into the frame without needing a knob at all, making this an accessory for specific configurations rather than a universal requirement.

Type	Hand-tighten knob for ARC handles / ARC Hand Bolts
Colors	Black, Red, White, Blue, Gray, Purple
Sold as	Pair, includes plastic washers
Material	3D-printed body with an embedded stainless-steel nut
Lead time	2-3 weeks depending on order volume
Manufacturer	Mutant Metals
Thread sizes	1-8 or 5/8-11
Compatibility	ARC system or Mutant Metals handles only

What is a Miscellaneou?

What’s in Miscellaneous

This is the catch-all for the conditioning tools and accessories that don’t fit a single equipment class — weighted vests and plate carriers, medicine and slam balls, plyo boxes, ab mats, and the odds and ends that round out a garage gym. Items land here because their job (loaded carries, jumps, core work) cuts across the categories rather than sitting neatly inside one.

Who it’s for

Anyone filling in the gaps around the big pieces. If you already have a rack, bar, and plates, this is where you find the vest for rucking and weighted push-ups, the ball for slams and wall throws, or the box for step-ups and box jumps. Match the tool to the training you actually do — a plate carrier for conditioning and rucking, plyo boxes for explosive work — rather than buying the whole shelf.

How it compares

	ARC Speed Knobs	9.22 Magnetic Rack Badges	EZ Deadlift Loader Straps	Certified Training Facility Package
GymRadar rating	5.0/5	5.0/5	5.0/5	5.0/5
Price	$15.99	$19.99		$63.00
Type	Hand-tighten knob for ARC handles / ARC Hand Bolts
Colors	Black, Red, White, Blue, Gray, Purple
Sold as	Pair, includes plastic washers
Material	3D-printed body with an embedded stainless-steel nut
Lead time	2-3 weeks depending on order volume
Manufacturer	Mutant Metals
Thread sizes	1-8 or 5/8-11
Compatibility	ARC system or Mutant Metals handles only

5.0/5 · 5 GymRadar reviews

Reviews by source

Expert

5.0/5

5 reviews

A small hand-tighten accessory for Mutant Metals’ ARC cable-attachment system, not a standalone piece of gym equipment – and the five GymRadar owners who rated it are unanimous. Its standout dimension is functionality: a grooved, 3D-printed knob over an embedded stainless-steel nut that lets you finger-tighten handles or ARC Hand Bolts without tools, praised as lightweight and quick to put on and take off. Build quality and value track the same way – reviewers call it “high quality and well built” at a price that “won’t break the bank.” The weakest dimension is versatility: it only works with Mutant Metals’ own ARC system or compatible MM handles, and video coverage of the newer Rogue-collab Mutant Metals ARC Cable Attachment notes that its latest handles thread directly into the frame, making the knob an optional add-on rather than a universal requirement on every ARC build.

+Functionality: finger-tightens directly to compatible handles or ARC Hand Bolts with no tools needed (Mutant Metals product page)
+Functionality: "amazing and light weight and super easy to put on and take off" (GymRadar review, Eddington's Gym)
+Build quality: embedded stainless-steel nut inside a 3D-printed body engineered for high hand-applied torque (Mutant Metals product page)
+Build quality: "high quality and well built, easy to grab and grip" (GymRadar review, ALLEN IRON CITADEL)
+Value: "nice build quality" and "don't break the bank" at $15.99/pair (GymRadar review, Basement Barbell)

−Versatility: designed exclusively for the ARC system or Mutant Metals' own handles -- not a universal fitting (Mutant Metals product page)
−Versatility: on the newer Rogue x Mutant Metals ARC, handles thread straight into the frame without a knob, and one reviewer called the $25-35 knob add-on "unnecessary" for that setup (YouTube: Bar Gym Reviews)
−Durability: no independent long-term wear data beyond user testimonials -- all five GymRadar reviews are recent and short on detail (GymRadar reviews)

$15.99

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