Self-countersinking nibs under head insure seating of screw head flush with work surface

3/4-10 x 8 Hex Cap Screw SS 316 (A4)

and the jaws open to a lock position when the screw is inserted

You can utilize these pieces of hardware in solid or hollow surfaces

straps that snap off flush with the wall every time

9/16 x 18 Ship Auger Wood Bit Reduced Shank Drill Bits - 1/2 Shank Self-countersinking nibs under head insure9 16 x 18 Ship Auger Wood Bit . Ship Auger Wood Drill Bits are heat treated with machine ground hollows. Feature a single twist with a single cutter and side lip. Made of premium steel, imported from France, Ship Auger Wood Drill Bits are ideal for boring CCA and creosoted poles, railroad ties, bulkheads and other heavy timber.