Mul-T-Lock Hercular is a high security Grade 1 class deadbolt suitable for commercial and residential application.  Its bolt  feature an interlocking two hardened ball bearings with the strike to increase jimmying resistance.  The lock is resistant againt picking, bumping & drilling attack.

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Mul-T Lock KIK cylinders can also be retro-fitted to most other brand of  deadbolt to increase their security level.