The RanchEx locking pin with a square wire retainer has a one piece fastener which means no more cotter pin loss! Wire is pulled over the pin end to secure it. Quickly installs and removes and fits most quick release applications. Has a yellow zinc dichromate plating for a corrosion resistant barrier so your lock pin lasts long and looks good. Measurements: 5/16" in diameter, 2-1/4" usable length. For a variety of farm, garden and industrial applications. You can trust RanchEx to provide durability and reliability for all your farm, ranch, and home and garden needs.