Thumb turn can be unlocked and taken with you, to convert to double cylinder lock. Caution: double cylinder function should only be used when the building is unoccupied. Always check local building codes.

Best for doors with windows, or where there is a window next to the door

Bump, Drill and Pick resistant

Restricted keys: no unauthorized duplication

Anti-drill pins above the shear-line of the cylinders

Hardened steel bolt mechanism

Ball bearings in bolt lock the bolt into the strike box to protect against prying attack

Works on 2 3/8 and 2 3/4 backset: adjustable bolt

Spacers required for doors less than 1 3/8 thick

Conforms to ANSI Grade 1 and ul fire rated bolt

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Mul-T-Lock Key Captive Grade 1