if you choose a double-cylinder deadbolt, make absolutely certain your family knows where the key is and leaves it there. Calling a locksmith out for this how to install a deadbolt lock job will ...

Deadbolts significantly improve security over key-in-knob locks alone ... You might not want to spring for a double-sided lock, though. Many municipalities consider them to be a fire hazard ...

Application Locks for shops and entrance doors to ... Cylinder and accessories bolt through lockcase for added strength. Key can be removed in locked or unlocked position. Specification Hardened steel ...