The Viro Discus padlock is made of high grade stainless steel for extra strength and corrosion resistance. The 10mm diameter hardened steel shackle, coupled with raised shoulder guards on the padlock body, make the shackle virtually inaccessible to bolt cutters and nearly impossible to cut. This padlock is ideal for outdoor use on bicycle chains, gates and trailers. Supplied with a single flat dimple nickel plated key.