3Pcs 3-12mm 4-12mm 4-20mm Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Cone Drilling Tools Set(3pcs)

To removing chips, with big space and small resistance; Smooth chip removal, less heating value,Sharp cutting edge, reduce cutting force, lower breaking rate and improve the quality of hole wall;Length:3-12mm Length: Approx. 7.9cm/ 3.11"4-12mm Length: Approx. 6.7cm/ 2.64"4-20mm Length: Approx. 7.4cm/ 2.91"The Cutters Come in the Following Sizes:3-12mm(3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm) 10 Steps4-12mm: (4mm, 6mm, 8mm, 10mm, 12mm) 5 Steps4-20mm:( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)9 StepsPackage included:1 x Drill Bit 3-12mm1 x Drill Bit 4-12mm1 x Drill Bit 4-20mm

• To removing chips, with big space and small resistance; Smooth chip removal, less heating value,
• Sharp cutting edge, reduce cutting force, lower breaking rate and improve the quality of hole wall;
• Precision machining by high accurate equipment;
• With good milling and cutting performance, ensuring high efficiency;
• High hardness, wear resistance, and intensity; anti-bending;
• To removing chips, with big space and small resistance; Smooth chip removal, less heating value,
• Sharp cutting edge, reduce cutting force, lower breaking rate and improve the quality of hole wall;
• Symmetrical cutting blade, help to high effective cutting, avoiding drilling offset.