Easy fit replacement for most mortise locks of the same overall width. Mortice lock follower suitable for 5/16" or 8mm spindle. Deadbolt is locked or unlocked by key from outside and inside. Steel Case with Integral Anti-Drill Plate on cap and case. 5 Close gated levers with built-in anti-pick device. 2 Hardened steel rollers in brass deadbolt. Rebated conversion sets available 13mm & 25mm No. 42. Mechanism: 5 Lever. 3 Steel, plated, unnumbered keys. The box striker/locking plate is constructed from STEEL to resist attack and to meet the requirements of British Standard BS3621:1998 for Thief Resistant Locks.