Features:Laser marking makes the size more clear;High speed steel for longer service life;Used on electric drills and drill presses;Double cutting edges 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:Surface Treatment: Titanium CoatedMaterial: High Speed SteelShank Size: 6.3mm / 0.25 inch3-12mm:Step Quantity: 10Total Length: 78mm / 3.1 inchesCutting Diameters: 3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm4-12mm:Step Quantity: 5Total Length: 70mm / 2.8 inchesCutting Diameters: 4mm,6mm,8mm,10mm,12mm4-20mm:Step Quantity: 9Total Length: 71mm / 2.8 inchesCutting Diameters: 4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm Package Contents:3 x Step Drill Bits1 x Hop-pocket Maintenance Tips: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.
