Case Depth: 76 mm Case Height: 89 mm Cylinder Backset: 56 mm features: This British Standard High Security Euro Cylinder Lock to BS3621:2004 standard meets the exacting demands of the insurance companies and the Police. Higher security levels are delivered by a 20mm bolt throw on every lock, hardened steel plates to resist drilling, and four hardened steel rollers in the deadbolt to resist hacksawing. Each lock comes complete with a High Security 6 pin Euro Profile Cylinder resistant against picking or drill attack. Bolt through heavy-duty security roses protect the cylinder.