![]() ![]() This non-profit group was developed by the Builder’s Hardware Manufacturers (BHMA) to set standards for a variety of industries. The grades are assigned by the American National Standards Institute (ANSI). The best grade of deadbolt lock is Grade 1. Use a double-cylinder lock on doors that have a window made of old, weaker glass.ĭeadbolt locks come in three different grades that indicate their level of security.Use a single-cylinder deadbolt lock on doors that have a window made of tough modern glass. ![]()
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