The Reese Towpower Class II Interlock Starter Kits come complete with ball mount, hitch ball, pin and clip. Built tough for unparalleled strength, Reese ball mounts fight rust and corrosion with Metal Shield, a superior coating for years of protection from the elements. The Reese patented Interlock design features a "One Wrench" tightening system that allows for one-handed tightening, unlike traditional designs that require two hands and two wrenches. Simply align the hex shapes of the Interlock hitch ball into the hex on the bar and tighten. It's that easy.