Layers of steel plates rivetted together with steel rivets to produce an immensely strong lock to resist attack, 4 pin tumbler with black plastic sleeve - 1024 key variations. Designed to secure sheds because they are the correct size, of the correct strength and will function reliably in outdoor conditions for a long period of time. Size across case. 63mm. Shackle Clearance Vertical: 64.8mm (Hardened Mild Steel) Type: 35212 Keyed Alike available.