Uxcell Step Drill Bits Set Hss 3-12Mm 4-12Mm 4-20Mm Titanium Coated Straight Flutes Hex Shank For Metal Wood Plastic

Features:Laser marking makes the size more clear;Double cutting blades design enables a faster and smoother cutting;Hexagonal shank prevents slip in electric drills and presses’ chuck;X-type openings design to facilitate the removal of cutting waste when drilling;The sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease;Specifications:Material: High Speed SteelSurface Treatment: Titanium CoatedShank Diameter: 6mm / 0.24 inch3-12mm:Step Quantity: 10Total Length: 80mm / 3 inchesCutting Diameters: 3mm/0.12", 4mm/0.16", 5mm/0.2", 6mm/0.24", 7mm/0.28", 8mm/0.3", 9mm/0.35", 10mm/0.4", 11mm/0.43",12mm/0.47"4-12mm:Step Quantity: 5Total Length: 70mm / 2.7 inchesCutting Diameters: 4mm/0.16”, 6mm/0.24”, 8mm/0.3”, 10mm/0.4”, 12mm/0.47”4-20mm:Step Quantity: 9Total Length: 72mm / 2.8 inchesCutting Diameters: 4mm/0.16", 6mm/0.24", 8mm/0.3", 10mm/0.4",12mm/0.47", 14mm/0.55", 16mm/0.6", 18mm/0.7", 20mm/0.8"Package Contents:3 x Step Drill BitsMaintenance Tip:1.Not for hammer drill.2.It is recommended to oil the bit before every use.3.Please drill a smaller hole to make drilling smoother.4.Please do not set drilling speed too high to avoid damages to cutting edge.5.The metal sheet on which you want to drill should not exceed 0.38” in thickness.6.Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck, for it may cause the drill bit broken and make drill hole too large.