The Squire Stronglock Laminated Padlocks are a medium to high security durable padlock, with a hardened steel shackle with a covered steel padlock body with anti corrosion finish. The 4-pin tumbler lock mechanism gives over 1,000 key variations. Recommended for sheds, garages, lockups, gates, greenhouses, toolboxes, lockers etc. Keyed alike and masterkeyed available to order. CRIMESTOPPERS endorsed. Size across case 45 mm. Shackle clearance Vertical 20 mm (hardened mild steel). Type 37. Keyed-alike available.