Strong, secure and seriously tough, this Squire Mercury padlock is built to last. Featuring hardened boron alloy steel shackles and an anti-pick high precision lock cylinder, the 60mm padlock is made from a robust die-cast steel to deliver high security and high reliability. Double-locking boron shackle for strength and security. Four-pin tumbler locking mechanism. Anti-pick, high-precision lock cylinder. Robust die-cast steel construction. Suitable for indoor and outdoor use. • Supplied with three keys