Stack of Weights for Gym Barbell Rack Attachment Barbell Rack Add Weight Description: [Premium and Reliability] The gym pin is made of high quality steel, which is sturdy, durable, not easy to break and has a long service life. [High Performance] Longer pin length helps maintain weight level when moving along the bar. [Easy to Use] The weight stack locking pin is lightweight and easy to insert and remove, convenient for daily use. [Wide Application] The weight stack extension pin can be attached to the designated machine to exercise wrists, fingers, forearms and elbows, arms, biceps and triceps. [Nice Accessories] The exercise pin is an essential addition to exercise machines, as well as a great gift for family, friends, and fitness lovers. Specification: Material: steel Size Chart: Suitable for barbell plates with a hole diameter of 25 cm or 9,84 inch The package includes: 1 stack of exercise weights, 1 spring clamp