The ONLY true "16mm" Sold Secure Gold Approved security chain currently on the market. Prestige top of the range high security packages. 16mm Dia close link chain. Highest grade alloy steel - through / case hardened process for maximum strength. This chain cannot be bolt cropped or sawn by hand. Sleeved and plastic cuffed to prevent fraying. Available in four stock lengths: 1.2m, 1.5m, 2.0m, 2.5m. Squire SS65CS Sold Secure Gold approved padlock included. 13mm Boron steel Hardened close shackle. Hardened steel lock body. Six pin cylinder / tumbler lock mechanism - double locking. Anti-drill protection on cylinder. Anti-corrosion finish. CEN No. 6 security rating. For low duty chain locks for bicycles click here: Bicycle Chain Locks