JR Products Safety Lock Pin. Safety Lock Pins are designed for a secure trouble-free installation. The snap lock bale is spring tensioned for a strong holding action. Pin is zinc plated and made of high strength steel that is rust and corrosion-resistant for a long life. Use anywhere a strong, secure safety pin is needed. Packaged. 5/16in dia. width 2-9/16in usable length 1-23/32in loop clearance 2-25/32in pin length.