Kigauru 6Pcs Titanium Coated Drill Bit Set, High Speed Steel Step Drill Bit 4-12mm / 4-20mm / 4-32mm and Twist Drill Bits 3mm / 6mm / 8mm for Metalworking, Woodworking, Hole Drilling with Storage Box - MG-140

• Size: Step drill bits 5 steps, 4mm, 6mm, 8mm, 10mm, 12mm. 9 steps, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm. 15 steps, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm,30mm,32mm. Twist drill bits 3 most common size 3mm, 6mm, 8mm, to satisfy all your needs. Material: Made of high-speed steel material with titanium coating, the drill bit has sharp edges, making it more effortless and faster to use. The titanium coating can prevent drill bit corrosion and rust, reduce friction, and its service life is 2 times that of standard impact drill bits. Step Drill Bit Practicality: X-type opening design can facilitate the removal of cutting waste when drilling to keep the drill bit clean. High Step design let you feel the stop and never drill bigger in mistake. The step drill bits can be used to chamfer, bur, and drill or enlarge holes. Twist Drill Bit Efficiently: Quickly decreases friction and heat for a faster and cooler drilling performance. The sharp serrations belt design can continue to drill horizontally after drilling. 135° Split Point with straight shank prevents walking and makes drilling precise and faster. Widely Used: Perfect step drill bits suitable for drill holes in various material. Within 3mm / 0.12 inch (Iron Plate, Copper Plate, Aluminum Plate), within 5mm/0.2 inch (Wood, PVC sheet, Insulation Boards). Twist drill bit suitable for pulling groove, boring or cutting 1mm-2mm of thin wood, solid wood, MDF, plastic board, aluminum, thin iron sheet, aluminum alloy. Note: not suitable for hard and brittle materials such as stainless steel, glass, tile floors, walls etc.