Sharp & Wear-Resistant: These drill bits are made of 4241 high speed steel with titanium coating for proven capability and durability. 230 Pcs Drill Bit Set: Including 32 Piece 1mm, 30 Piece 1.5mm, 30 Piece 2mm, 30 Piece 2.5mm, 20 Piece 3mm, 20 Piece 3.5, 12 Piece 4mm, 12 Piece 4.5, 12 Piece 5mm, 8 Piece 5.5mm, 4 Piece 6mm, 6 Piece 6.5mm, 4 Piece 7mm, 2 Piece 7,5mm, 3 Piece 8mm, 2 Piece 8.5mm, 1 Piece 9mm, 1 Piece 9.5, 1 Piece 10mm.
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