Master Lock Receiver Pin & Clip with Pivot Lock. It has a built-in pivot lock instead of a pin and a stainless sleeve to make this single unit good to fit 1/2" or 5/8" size receivers. It has a bent pin style for tight & hard to reach receivers with a tapered end for easy insertion. It is made of hardened steel for improved cut & shear resistance and is nickel & chrome plated. The pivot lock pivots to insert or to lock the pin in place.