Step Drill Bit Set Cone Hole Cutter 3Pcs Set 4-20mm 3-12mm 4-12mm Steel Titanium

High-Speed Steel large step cone drill. 4-20mm : (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm). 4-12mm : (4mm, 6mm, 8mm, 10mm, 12mm). 3-12mm : (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm).

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