These quick release fasteners provide positive locking in quick change applications where there is frequent insertion and removal of a fastener. They are designed to be used with the ball-locking receptacles referenced on the table. The pin can be threaded into the fixture and the receptacle is mounted to the base. When the knob is rotated, the balls on the pin expand and lock the fixture in place. These fasteners will not release until the knob is turned to "OFF", allowing the balls to retract into the shank so that the pin can be removed from the receptacle without the use of tools. The end of the pin is tapered to make alignment of the pin easy. They can be used with locating pins to provide highly accurate positioning. The knob is made from 304 stainless steel. The shank is made from 420 stainless steel. The balls made from hardened 440C stainless steel. The spring is made from 304 stainless steel. Used with the receptacles referenced on the table.