3-12/4-12/4-20/4-32mm HSS Straight Groove Step Drill Bit titaniums Coated Wood Metal Hole Cutter Core Cone Drilling Tools Set(3-12) DIOBFZFY

DIOBFZFYFeatures:Made from high HSS steelIdeal for using to cut holes in a variety of materials including steel, brass, wood, , etc.titaniums coated to reduce mit and heatHeat treated and highly polished. Drills round holes in steel, brass, , wood etc.3 sided shanks design in order to prevent 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:180-2404-32 Speed:180-240Attention:Because of the outer diameter of each step of the step drill is gradually expanded,then the corresponding cutting resistance and linear velocity will also be gradually increased.Owing to the step drill is dependent on the inclined edge that is only with 1mm length,If the feed speed is too fast when drilling,it will be easily to be annealing caused by abrasion of the oblique edge. give a downward when drilling, do not press down too hard to avoid the edge wearing.Suitable material:Workpieces with hardness, such as wood, , PVC plate, iron plate, plate thickness within 3MM. 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"4-32mm Length: Approx. 10.2cm/ 4.02"The Cutters Come in

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