The Master Lock shackle lock no. 8377EURDPRO has a hardened steel body for maximum strength and reliability. The 16 mm diameter shackle is made from hardened steel and offers additional resistance to prying, cutting and sawing. Certified according to Sold Secure Diamond (bicycles), Gold (motorcycles) and ART 4. Universal lock for all bicycles and motorcycles: road bikes, mountain bikes, folding bikes, e-bikes, etc. Features: