3-12mm/4-12mm/4-20mm HSS Straight Groove Step Drill Bit Coated Wood Metal Hole Cutter Core Cone Drilling Tools Set 1Pcs(4-12)

Micro Drill BitsFunction: Deburring, Chamfering, Cutting or expanding holesSupporting tools: Pistol drill, Hand drill, Charging drill, Bench drill. (Water injection cooling while working, it can effectively extend the service life of the drill bit, especially in the case of continuous drilling)Rotating speed:3-12 speed:260-4004-12 speed:260-4004-20 Speed:180-240Suitable material: Workpieces with general hardness, such as wood, plastic, PVC plate, iron plate, plate thickness within 3MM. Please note that stainless steel and spring steel are not applicable. Not for quenching. (Water injection cooling while working, it can effectively extend the service life of the drill bit, especially in the case of continuous drilling)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 3-12mm/1 x Drill Bit 4-12mm/1 x Drill Bit 4-20mm

• Micro Drill Bits