sourcing map Step Drill Bit 4mm to 12mm 5 Sizes HSS M35 Cobalt Straight Flutes Hex Shank for Metal Wood Plastic

• Shank Type: 6.3mm Hex Shank; Material: HSS M35 Cobalt; Drilling Diameters: 4mm, 6mm, 8mm, 10mm, 12mm.
• This step drill bit is durable and strong enough to punch and drill clean holes in materials like metal, wood, etc.. It can also help to enlarge existing holes and clean edges.
• It is Great for drilling holes for iron, metal, aluminum, copper, wood, plastic, PVC board and many other types of sheets.
• Suitable for hand-held drilling rigs, drilling machines, milling machines and machining centers, for metal sheet, maintenance and modification, bridge doors and windows, home appliances, etc..
• Note: High temperature will affect the working life, please use coolant while drilling on metals to ensure the drill bit working properly. Please keep it properly preserved. Avoid falling the bits from high place.

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; Hex shank prevents slip in electric drills and presses’ chuck; X-type openings design to facilitate the removal of cutting waste when drilling; The sharpness ensures easily cut through most metal, aluminum, plastic, wood and other materials with ease; Specifications: Material: M35 Cobalt Shank Size: 6.3mm / 0.25 inch Step Quantity: 5 Total Length: 70mm / 2.8 inches Cutting Diameters: 4mm,6mm,8mm,10mm,12mm Package Content: 1 x Step Drill Bit 1 x Plastic Package 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.