Material and Treatment: Cobalt high speed steel with Titanium coating. Dark bronze-colored or bronze-colored. It's more durable and wear resistant.
Shank Advantage: Large bit has 3-sided shank and small bits have hex shank to prevent slip in drill chuck
Efficient Drilling: Two-flutes design gives faster and smoother cutting.
Widely Usage: It's suitable for drilling holes in various materials, including carbon steel, sheet iron, copper, aluminum, wood, plastic, etc. (The recommended thickness of material is within 3/16").
Package: 5pcs in aluminum case. Step drill bit size 1/4"-1-3/8", 3/16"-7/8", 1/4"-3/4", 1/8"-1/2", 3/16"-1/2", each one piece.
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