Knowing if a deadbolt lock offers maximum security is straightforward. It must meet the following requirements.
■ Its connecting screws must be able to pass through solid metal stock, and one-fourth inch in diameter at standard.
■ The head of the connecting screws must be on the interior side of the door, and none must be exposed on the exterior side.
■ Bolt must be made from hardened steel and protruding one inch from the door.
■ The cylinder collar must be crafted from solid metal and not hollow. It must be round, hard to grip, and tapered.