C.E. Smith Coupler Lock Brass. Brass coupler lock prevents theft and accidental uncoupling.Brass Solid cast and heat treated for toughness Corrosion resistant Fits standard trailer coupler lock levers 1/4" lock pin 3/4" wide openingComes with 2 keys Specifications for C.E. Smith Brass Coupler Lock: Manufacturer: C.E. Smith Color: Silver Package Contents: C.E. Smith Brass Coupler Lock C.E. Smith 00900-40: Coupler Lock Brass