The Drive® anchor is a one piece

1-8 x 5 A307A Hex Tap Bolt Zinc Plated

13/32 x 12 High Speed Aircraft Bit Cobalt

1/2-20 x 4 1/2 Hex Cap Screw SS 316 (A4)

1 1/2 x 6 Reduced Shank Drill Bit (1/2 Shank)

1/4-20 x 1 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (3,000) Tie Wire Split Drive Anchors Zinc Plated The Drive® anchor is a1 4 20 x 1 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (3,000) . Black Zinc is an acidic, low temperature powdered product developed to impart a black conversion coating of zinc die casting, galvanized stock and electroplated zinc parts. The black coating serves as a base for organic coatings (lacquers, paints, waxes and oils) and also provides an esthetic appeal.