Securit Anti-snap Anti-bump Thumb Cylinder Nickel 3 Keys, 40 x 40mm Securit Anti-Snap Anti-Bump Thumb Cylinder Nickel 3 KEYS. 40 x 40mm Securit Anti Snap Thumb Turn Cylinder|40mm x 40mm|Nickel, for UPVC or security euro style locks|3 Keys supplied|Anti Bump Anti Snap Anti Drill Anti Pick 10 Year guarantee