Made of 316 stainless steel material. D Type Coupler Spring Pin is well-designed, tough, and corrosion-resistant. Easy installation. Perfectly hold coupler latches, jack legs, pivot hooks, and more. D-shaped quick release, elastic lock, stable structure, which ensures strength during use and prevents accidental release. Suitable for farm, lawn, garden, hitch, PTO, and industrial applications. Easy to Use Simply slide the base of the folding roller pin into the corresponding slot and lock the swivel pin securely.