BAMILL 3pcs HSS Step Drill Bit Titanium Coated Wood Metal Hole Cutter With Center Punch

Features: *Made from high quality HSS steel *Ideal for using to cut holes in a variety of materials including steel brass wood plastic etc. *Titanium coated to reduce mit and heat *Heat treated and highly polished. Drills perfectly round holes in steel brass plastic wood etc. *3 sided shanks design in order to prevent slippage when in chuck *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: 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:260-400 4-12 speed:260-400 4-20 Speed:180-240 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 thickness within 3MM. Please note that stainless steel and spring steel are not applicable. Specifications: *Material: High Speed Steel *Color: Gold *Finish: Titanium Coated *Length: 3-12mm Length: Approx.52mm/ 2.04 4-12mm Length: Approx. 40mm/ 1.57 4-20mm Length: Approx.47mm/1.85 *The 3 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 *Center Punch Length: approx. 130mm *Quantity: 4pcs Package Includes: 1 x Drill Bit 3-12mm 1 x Drill Bit 4-12mm 1 x Drill Bit 4-20mm 1 x Center punch Notes: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.