uxcell 6pcs Jobber Drill Bits 5.5mm (0.217") Black Nitride & Gold Titanium Coated M2 High Speed Steel (HSS) Twist Drill Bits for Stainless Steel Aluminum Alloy Metal

Cutting Edge Diameter: 5.5mm / 0.217"Round Shank Diameter: 5.5mm / 0.217"Cutting Edge Length: 64mm / 2.52"Overall Length: 93mm / 3.66"Split Point: 135 DegreeMaterial: M2 High Speed Steel (HRC64-66)Finish: Titanium & Nitride Coated (TiN Coated)Package Content: 6pcs x Twist Jobber Drill BitsDescriptions:M2 high speed steel drill bits offer excellent heat resistance and hardness for durability and longevity, as well as good cutting performance and accuracy for clean, precise holes with minimal burrs.Black nitride and gold titanium dual coatings can apply lubricant better for smoother drilling and are more durable and corrosion resistant. Sharp cutting edges provide neat and smooth cuts. Large spiral grooves facilitate the export of metal chips.Drill bits produce holes in stainless steel, cast iron, A3 steel, carbon steel, aluminum alloy, copper, wood and plastic. Most suitable for drilling metals with a hardness less than HRC38, and cannot drill quenched metals, tiles, concrete, walls, stones.The standard straight round shank can work with handheld drills, drilling machines, bench drills, machining centers, CNC lathes, etc. Use an appropriate lubricant (such as cutting fluid or oil) to reduce friction and heat build-up.Notices:Controlling the speed is very important, recommended speed: 100-800rpm/min. The larger the diameter, the slower the speed required. Start the drill at a slow speed and gradually increase to the desired drilling speed.Make sure the drill bit is tightened securely, keep the drill bit perpendicular to the work surface, and apply steady pressure. If the hole is larger than 6mm, first drill a small hole with a 3.2mm-4mm drill bit, and then use a larger drill bit to enlarge the hole.