1 1/8-12 Nylon Insert Locknut Zinc Plated

25/32 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

1-8 x 9 Socket Cap Screw Alloy

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8-32 x 5/16 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10,000) Reduced Shank Drill Bits - 3/8 Shank 1 1/8-12 Nylon Insert Locknut8 32 x 5 16 Phillips Flat 82 Undercut Machine Screw Black Zinc Plated (10,000) . 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.