Pin Overall length: 4.18″ Tip Diameter: 0.375″ Head diameter: 1.25″ Kamparts has the most complete selection of weight stack pins in the world. This stylish, anodized magnetic weight pin looks like it belongs in every weight room. Reinforced steel wire impregnated lanyard insures longevity and bounce back. Calibrated lengths are made for proper size weights and will not protrude. Magnetic pin lock space measure true to length. Non-magnetic pins lock space is defined from end of knob to ball bearing. Please make sure you are ordering the correct length pin for your weight stack. When measure, pin should go through stack, selector stem and well into the other half of the plate. The pin should cover up to at least 75% of the stack depth.