The 5⁄8-inch-diameter receiver lock for our Power Wagon is designed for Class III, IV, and V hitch receivers. It is long enough to fit both 2-inch and 21⁄2-inch hitch receivers. BOLT also offers a 1⁄2-inch-diameter receiver lock for 11⁄2-inch hitch receivers. The receiver lock features include an auto-return spring that automatically locks when the key is removed; a solid stainless steel pin; and a six-plate tumbler sidebar that prevents picking and bumping. We appreciated the integrated, easily removable cover (which stayed pliable in very cold weather) and the automotive-grade stainless steel lock shutter, both of which are designed to keep out weather and debris. We had no problems installing or removing the receiver lock even when it was covered in ice and snow. The receiver lock would also be useful to secure a winch cradle to a hitch receiver.