600 LB Rated Jammer Arms Pair - Adjustable Monolift Attachments

In this review the Fitvids 600 LB rated Jammer Arms are assessed for lifters who want a compact way to add guided movements and belt squat capability to a standard rack. The bottom line is simple: these lever arms turn a 3' x 3' squat rack into a multi-function station without the cost or footprint of a standalone belt squat machine. The review focuses on build quality, compatibility with common rack hole sizes, and how straightforward the arms are to use for exercises like rows, curls, and guided deadlifts.

Key Features

• 600 LB per arm rating: Provides a high working capacity so users can load heavy sets confidently for compound lifts and belt squat variations.
• Universal fit for 3' x 3' racks: Designed to fit standard 3 in x 3 in squat frames so most garage and commercial racks are compatible.
• Fits hole diameters 5/8 in or larger: Works with common hole patterns so installation is quick without additional hardware for most racks.
• 11-gauge steel construction: Black powder coated 11-gauge steel offers durability and a scratch-resistant finish for frequent gym use.
• 9.8 in weight horn length: Gives ample barbell or plate clearance for comfortable loading and a stable lever arm on seated or standing movements.
• Replaces bulky machines: Lets users perform belt squats and guided lifts without buying an expensive dedicated machine, saving space and cost.

Who It's For

The Jammer Arms are best for home gym owners and trainers who already own a compatible 3 in x 3 in squat rack and want to add versatility without buying specialized equipment. They suit lifters who perform heavy accessory work such as belt squats, rows, and mechanics-sensitive guided deadlifts.

Those who should look elsewhere are people whose racks have posts smaller than 3 in x 3 in or hole diameters under 5/8 in, and users who need built-in safety features of some commercial machines rather than a simple attachment.

Pros & Cons

Pros

• Solid construction from 11-gauge steel provides a durable feel that matches customer impressions of good build quality.
• High 600 LB per arm capacity supports heavy loading for compound and accessory lifts.
• Simple compatibility with 5/8 in or larger holes makes the arms easy to attach across many racks.
• Weight horn length gives practical clearance for plates and bars during use.

Cons

• Some users reported fit appearing a little short on nonstandard racks, so confirm post dimensions before purchasing.
• Does not replace all features of dedicated belt squat machines, such as integrated platforms or guided carriage systems.

Specifications

Brand	Fitvids
Rated capacity	600 LB per arm
Compatible rack size	3 in x 3 in squat racks
Required hole diameter	5/8 in or larger
Material	11-gauge steel, black powder coat
Weight horn length	9.8 in

Our Verdict

The Fitvids Jammer Arms offer a durable, space-saving way to add guided lifts and belt squat capability to a compatible 3 in x 3 in rack. For lifters who value versatility, solid construction, and strong load capacity, this pair is good value compared with buying a dedicated machine; just confirm your rack hole size and post dimensions before ordering.

Frequently Asked Questions

Will these fit my rack?
They fit racks with 3 in x 3 in posts and hole diameters of 5/8 in or larger; measure your post and hole to be sure.

How much weight can each arm hold?
Each arm is rated to 600 LB, so plan loading per arm rather than combined load across both.

Can I use them for belt squats?
Yes, they are designed to allow belt squat movements and other guided exercises without a full machine.