This 1-1/4" roller buckle is made of steel and black-plated. The roller buckle features a 1000-lb breaking strength. This 1-1/4" single prong roller buckle comes with a black-plated steel tongue. The width of the strap that this buckle can fit through is 1-1/4"(6.35mm). This roller buckle is ideal for use with luggage, purses, pet collars, camera straps, and other strap applications.