Compatible with Most 3" x 3" Power Racks These safety spotter arms are designed to fit most squat racks or power cages with 5/8" & 1" holes, allowing you to customize your home gym setup and train with confidence. They are also ideal for garage gyms, or commercial gyms. Adjustable Height and Easy Lock Design You can easily adjust the safety catch to the desired height for different exercises, such as deep squats or bench presses. The easy lock design lets you slide the pin into the hole of the power rack and swing down to lock in place securely and quickly. Heavy Duty Steel Construction and Powder Coat Finish These safety spotter arms are made of high quality steel with a durable powder coat finish to help prevent rust and corrosion. Each arm can hold up to 500 lbs, making them suitable for heavy lifting and high intensity workouts.Such as squat, bench press, deadlift, shoulder press, and more.