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

Metalworking & Multipurpose Drill Bits / Micro Drill BitsFeatures:Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc.Heat treated and highly polished. Drills perfectly round holes in steel, brass, plastic, wood etc.3 sided shanks design in order to slippage when in chuckTwo flute design drives faster, smoother and cleaner cuts each step is clearly labeled with the depth diameter in stepsFunction: 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:180-240Length: 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 4-20mm1x Bag(Option Option and Blue or Black Random Delivery)

• Metalworking & Multipurpose Drill Bits Micro Drill Bits