3-12/4-12/4-20/4-32 mm HSS Straight Groove Cone Step Drill Bit Set Titanium Coated Wood Metal Hole Cutter Tapered Drilling Tools

Specifications : 1.Shank Dameter: Straight Groove: 3-12/4-12/4-20/4-32: 6.35mm 2.Length: Straight Groove Step Drill : 3-12mm Length: Approx. 7.7cm/ 3.03" 4-12mm Length: Approx. 6.7cm/ 2.64" 4-20mm Length: Approx. 7.7cm/ 3.03" 4-32 Length: Approx. 10.2cm/ 4.02" Spiral Groove Step Drill : 4-12mm Length: Approx. 6.3cm 4-20mm Length: Approx. 7.2cm 4-32mm Length: Approx. 10cm 3.Rotating Speed: 3-12 speed:260-400 4-12 speed:260-400 4-20 Speed:180-240 The Cutters Come in the Following Sizes: 3-12mm (3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm) 10 Steps 4-12mm: (4mm, 6mm, 8mm, 10mm, 12mm) 5 Steps 4-20mm: ( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)9 Steps 4-32mm: ( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm)15 Steps Features: 1.100% Brand New and High Quality 2.Made from high quality HSS steel 3.Ideal for using to cut holes in a variety of materials including steel, bra, wood, plastic, etc. 4.Titanium coated to reduce mit and heat 5.Heat treated and highly polished. Drills perfectly round holes in steel, bra, plastic, wood etc. 6.3 sided shanks design in order to prevent slippage when in chuck 7.Two flute design drives faster, smoother and cleaner cuts each step is clearly labeled with the depth diameter in steps Function: Deburring, Chamfering, Cutting or expanding holes Supporting tools: drill, Hand drill, Charging drill, Bench drill Suitable Material: Workpieces with general hardne, such as wood, plastic, PVC plate, iron plate, plate thickne within 3MM. Please note that stainle 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) Package includes: 3 Pcs Set A:3-12 4-12 4-20 Straight Groove Step Drill (Black /Gold) or 3 Pcs Set B : 4-12 4-20 4-32 Straight Groove Step Drill(Black /Gold) or 3 Pcs Set A Plus: 3-12 4-12 4-20 Straight Groove Step Drill +1 Pc Center punch(Black /Gold) or 3 Pcs Set B Plus:4-12 4-20 4-32 Straight Groove Step Drill +1 Pc Center punch(Black /Gold)

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Shipping and Packaging All itwill be double checked and well packed before sending.Itwill be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the package to the destination(for remote areas,it may take a little longer). 

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