3PCS/Set Step Drill Bits Triangular Shank Drilling Bit High\-speed Tools

Multifunctional: This step drill bit is suitable for deburring bevelling drilling punching and other occasions you can use it on steel brass wood plastic and other materials helping you punch holes quickly and easily. Non-slip: The triangular shank ensures your security because it can prevent slipping effectively the 2 flute design helps to drill proper holes and grooves conveniently. Sturdy: Made of high-speed steel material this drilling bit is durable and reliable you can use it for a long time without being broken or cracked you do not need to change it frequently. Maintenance: When drilling you can add cold water to cool the temperature prolonging the service time of the punching bit effectively and please do not press it down when drilling. Package included: There are 3 pieces of drill bits in total and the size is 4-32mm enough to meet your different needs good replacement for the old or damaged one. Material: high-speed steel. Color: silver. Size: show as pictures. 4-12mm(5 steps): 4mm 6mm 8mm 10mm 12mm. 4-20mm(9 steps): 4mm 6mm 8mm 10mm 12mm 14mm 16mm 18mm 20mm. 4-32mm(15 steps): 4mm 6mm 8mm 10mm 12mm 14mm 16mm 18mm 20mm 22mm 24mm 26mm 28mm 30mm 32mm. As the outside diameter of each step is gradually enlarged the corresponding drilling resistance and linear velocity will also be gradually increased. Because the step drill completely depends on the inclined edge only 1mm long if the feed speed is too fast when drilling it is easy to abrade the inclined edge and cause annealing. Please give downward force when drilling but do not force down avoiding wearing the edge. Suitable for general hardness of materials such as wood plastic PVC board iron plate plate thickness within 3mm. Please note that stainless steel and spring steel are not applicable. Not for quenching. (Add water for cooling temperature when working which can effectively prolong the service time of the drill bit especially in the case of continuous drilling) Due to the light and screen difference the item s color may be slightly different from the pictures. Please allow a slight deviation for the measurement data and make sure you do not mind before ordering. 3 Pieces Drill Bits(with 1 Piece Bag).