These Detent pins have a spring loaded ball that retracts when it is inserted or removed. The ball and spring are made from 300 series stainless steel. The rings are made from steel for steel pins and stainless steel for stainless steel pins. Solid body provides maximum shear strength. The steel type are made from zinc plated C1144 steel, The stainless are made from 303. Other lengths are available. Commercial drill tolerances provide clearance for the pins.