Durable Material: Our 1 Leg Squat Roller Attachment for squat rack attachment is made of iron and PU material, strong and durable, has long service life. Strength Training: This Single Leg Squat Roller Attachment allows you to exercise your leg strength with bulgarian split squats or 1 leg lunges. Practical Design: The Bulgarian Split Squats Stand provides a comfortable exercise feeling. Easy to Install: This 1 Leg Lunge Roller Attachment fits 0.71inch (18mm) hole in the squat rack. Easily slide the squat roller into the squat rack, then tighten the knob. Portable: The Single Leg Squat Roller is portable and lightweight, perfect for home and gym use. Specification: Material: Iron, PU Size: Total Length: 55cm/21.65inch Screw Diameter: 1.8cm/0.71inch Package Includes: 1 Single Leg Squat Roller Attachment Note: Please allow slightly errors due to manual measurement and different monitors.