This 1/2in. diameter hitch lock is for 1 1/4in. x 1 1/4in. Class 2 receiver-style hitches requiring a 1/2in. diameter pin. 1.75in. bolt length. From the manufacturers of the original Deadbolt lock for hitches and trailers. Lock is double nickel chrome-plated for maximum corrosion protection. Features a patented, rugged, pick-proof screw-and-lock mechanism for total security. Easy key insertion and removal. Covered key opening and nonslip pin grip. U.S.A. 1-year limited warranty.