These Sandwich J-Hooks—compatible with our 2"x 3" squat racks, Smith machines, and power racks—will enhance any workout routine. They have a plastic lining to fully safeguard the knurling on barbells and minimize noise during lifting sessions. They also feature a meticulous design, allowing for quick and easy installations. Note: Exclusive for Major Fitness – Incompatible with other brands' Smith Machines & Power Racks!