Features: Make of Steel and Plastic materials, highly strength, strong and can used for long terms. Plug in locking mechanism makes it easy to adjust the weight plates. The creative designs ensures that the weight plates stay securely in place. Used with your fitness pulley system, effectively improve your strength training. Perfect for various warm sport and strength workouts like arm, shoulder or back training. Specifications: Materials: Steel and Plastic Styles: A/B/C Styles A/B Length: about 110mm/4.33inch Styles C Length: about 132mm/5.2inch Package Includes: 1Pc Weight Stack Pin note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.