PACKAGE INCLUDES:You will receive 3pcs weight stack pin,perfect for use at home or commercial gym accessories are ideal.It allows you to perform high-quality workouts in a comfortable environment that has never been easier. VERSATILE: The diameter of 3/8 “ ; locking space of 6”.Our weight stack pin are made of chrome-plated steel and plastic material,more stable and durable while providing more options for workouts.The rust-resistant materials ensures years of reliable use. EXTENSION OF LOCKING SPACE: The 6” extension pins long enough can attach the ring to the weight plate center bar and fits most machines.