Nylon vault key-hole signals are color coded by category. Colorfast, won't chip, and reusable with prongs that securely engage lock tumblers for tight key-hole fit. Withdraw and use again as needed. Offset head properly centers signal over key-hole opening. One universal size, 7/8" prong with 1/2" head, designed to fit most popularly used brand locks. U.S. patent no. 4,118,962.

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