Need to improve security on your sliding glass patio door? This versatile bolt lock can also be used for added security on windows. Toledo Lock's best Door Lock Hardware for Sliding glass Patio Doors & Windows, available keyed alike (same key) lock with Yale keyway for interior and exterior use. Locks for sliding doors have heavy duty 1 3/4" hardened steel bolt with 1/2" diameter which rotates to resist sawing and is reversible (left or right hand doors). Aluminum painted finish. Solidly locks sliding aluminum and wood patio doors and windows. Glass sliding door locks work great on regular hinged doors. Lock body size: 3-1/8" H X 1-1/16" W. Far superior protection than the cheaply made imports. Easy and fast surface mounted installation may require 1/8" drilled diameter holes. All mounting screws are hidden when lock is activated adding vandal protection. Strong case is prying resistant. Rekeyable Lock Security cylinder. Includes all installation hardware. These glass sliding door locks are among the finest in their class. A highly effective replacement lock compared to the standard die-cast door manufacturer lock, commonly known for their fussy operation. Order more than one sliding glass door lock and have them all working with same key FREE. Original blister packaging may be unsealed for keying & additional key duplicates. 100% guaranteed in materials and workmanship. Don't wait until becoming a theft or burglary victim, buy the best Sliding Glass Patio Door Locks Today. Don't just lock it...SECURE IT!