HPC's Specialty Locksmith Stamps allow you to permanently mark master or restricted keys. Let other locksmiths and key duplicators know it is a special purpose key and is part of a restricted system. The stamps are made of heavy-duty steel stock, and measure .375" x .625" (9.5 x 16mm), hardened and zinc plated for years of clear stamping. Characters are approximately 0.1- inch (2.5mm)
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