3-12 4-12mm HSS Step Pagoda Drill Bit Conical Stage Drill for Metal Wood High Speed Stepped Drill Set Power Tools 1Pcs(4-12)

Reduced Shank 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)Attention: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 completely 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.Please give a downward force when drilling,do not press down too hard to avoid the edge wearing.Suitable material:Workpieces with general hardness, such as wood, plastic, PVC plate, iron plate, plate thicknesswithin 3MM. Please note that stainless steel and spring steel are notapplicable. Not for quenching.(Water injection cooling while working, it can effectively extend the service life of the drill bit, especially in thecase of continuous drilling)

• Reduced Shank Drill Bits