These locks are made of the best raw materials. Also, we offer lifetime guarantee on all locks to prove this claim. The latches of unique locks and quadrilaterals part is make from brass and the forehead part is plated Iron . The internal parts of these locks are made of galvanized sheets are ant erosion so it decreases concern for dear customers. Unique service lock is available in one size ( 6.5)and one color (silver). Also our unique locks could pass 72 hours salt spray test and got CE certification of Europe.