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HTZ121VP is a Reliable #12 x 1" TEK metal screw featuring a hex washer head, self-tapping thread and self-drilling point. It is made of steel with a zinc-plated finish and is intended for compatible metal fastening applications. The screw has a 5/16" hex drive and is supplied in a 100-piece box. It is suitable for applications such as ventilation duct fastening and other installations requiring a #12 x 1" self-drilling screw. Verify the required screw size and application before installation.