Pozi Countersunk Self Tapping Screws A2 Stainless Steel. A self-tapping screw is a screw that can tap its own hole as it is driven into the material, they are often referred to as self tappers. Pozidrive countersunk head self tappers are used when a flush finish is required, with no part of the screw head protruding above the level of the item being fastened.
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