US PATENT No. 8,821,061

Our NEW Auto-Lock Safety Pull Pin features a retractable tip that locks into an extended (forward) position automatically. Conventional spring-loaded pull pins do not lock forward, allowing unintended retraction and disengagement due to vibration, movement and irregular mating holes. Our new forward-locked design means that the tip remains in an extended, locked position until manually disengaged by pulling the ring. Available options are illustrated below.