Comes pre-assembled and includes: 2 keys, 1 bolt, 1 security collar, washer, hex nut, threaded hitch ball to replace your tow ball during storage. The most secure coupler lock available. Patented design and solid steel construction make it all but impossible for thieves to cut, pry or disable. Universal fit for 2" and 2-5/16" couplers. 1-year warranty. Combo kit includes: 2 bolts, 2 collars, and 2 balls.