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

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

• Description Report Item / Suspicious Activity 3Pcs 3-12mm 4-12mm 4-20mm HSS Straight Groove Step Drill Bit Set Titanium Coated Wood Metal Hole Cutter Core Cone Drilling Tools
• 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. 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. Not for quenching.
• Specification: 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. 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
• Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1mm-1cm differences due to manual measurement. Package includes: 3x Drill Bit 1x Bag