Screws are made of 410 stainless steel.
The screws have a black oxide coating for higher density, better stability, durability, corrosion and wear resistance.
Self-tapping screws can be widely used in wood, plastic, metal.
The screw kit contains 5 sizes. 65pcs #8×1/2", 60pcs #8×5/8", 45pcs #8×3/4", 30pcs #8×1", 20pcs #8×1-1/4".