500 Self-Drilling Black Screws – These are actual drill-bit-tipped black screws. Pop them in the magnetic chuck driver and your variable-speed drill and away you go, no pilot holes, no wasted time. The screws are black anodized steel, 1/2″, #8. They have a combination slot/hex-drive head. Sold in packs of 500. Specifications: For both single wall and double wall stove pipe (NOTE: Do not penetrate the inner wall of the double wall stove pipe). 500 Self-Drilling Black Screws – These are actual drill-bit-tipped black screws. Pop them in the magnetic chuck driver and your variable-speed drill and away you go! No pilot holes, no wasted time. The screws are black anodized steel, 1/2″, #8. They have a combination slot/hex-drive head. Sold in packs of 500.
