Four Spiral Flute M35 Cobalt Step Drill Bit Set 1/4" - 1-3/8"(19 Sizes),Impact Ready Four Flute Step Drill Bit,3/8" 3-Flat Shank Step Bits for Hole Drilling Cutting on Metal, Steel, Aluminum

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About This M35 Cobalt Superhard High Speed Steel: ISI M35/1.3243/SKH55/M35 steel is a kind of high speed steel containing cobalt, which has the characteristics of high wear resista nce, high pressure resistance and sintering resistance. 【M35 step drill compatibility 】： step drills can quickly and smoothly drill holes of different diameters, such as stainless steel, aluminum, wood, plastic board (the board must be thinner than the height of the step drill) 【M35 four spiral groove】: step drill four cutting blade design. Faster, smoother cutting and easier separation of sawdust. 【Common sizes】: drill bits contain sizes from 1/4” to 1-3/8. Common sizes 7/8”, 1-2/16”, 1-3/8, minimum size 1/4, maximum size 1-3/8, total 19 sizes 【135 °cutting angle】 - The increased angle of the drill tip is more suitable for drilling hard materials than 118 °. Tip - The temperature of the drill will increase due to high speed rotation. It is suggested to add cutting oil or spray water to cool the drill during continuous operation, which can effectively prolong the service life of the ladder drill.If the product has any quality problems. Overview Material : Cobalt Steel Cutting Diameter : 1.38 Inches Finish Type : Aluminum Shank Type : 3-Flat Cutting Angle String : 135 Degrees Show more