Package contains 100 premium cotter pinsZinc plated carbon steel for corrosion resistance3/32" Diameter & 3/4" Length7/32" Outside Head DiameterStyle: Extended ProngA cotter pin is a fastener that is placed through two holes on one end of a clevis pin. It is used for locking and to hold an object in place. It is commonly split in the middle and has two tines that can be bent around the nut or bolt to secure machinery.