Specification Brand : ZANGING BulletPoint1 : 【M2 Cobalt Superhard High Speed Steel】:Our high-speed steel drill bits, fortified with a titanium coating that makes the drill bit harder than a typical HSS bit, of high speed steel containing cobalt, which has the characteristics of high wear resistance, high pressure resistance and sintering resistance. BulletPoint2 : 【100 extra-long warranty period】:If you have any questions about the product, please contact us and we will answer you within 12 hours. If the hexagonal handle breaks, refund or replace for 100% . BulletPoint3 : 【Unibit step drill bit compatibility 】:Unibit step drill bit 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. BulletPoint4 : 【M2 The two-flute 】:The two-flute spiral grooved design deburrs chip, dust and debris for clearance and smooth cutting. 135° split point tip drill reduces friction, pressure, and heat, making the drill bits long-lasting and efficient.With 31 step sizes, each hole made with these step bits will be precise. BulletPoint5 : 【12 Sizes :Including】:Step bit the bit contains sizes ranging from 3/16" to 7/8". Commonly used sizes are 3/16”, 1/4”, 5/16”, 3/8”, 1/2”, 9/16”, 5/8”, 11/16”, 13/16”, 7/8”, total 12 sizes,step bits For your everyday DIY needs. BulletPoint6 : 【TiAlN】:TiAlN coating is a new coating material in recent two years.ndustrial-grade construction ensures durability and longevity It has high hardness, high oxidation temperature, good thermal hardness, strong adhesion, low friction coefficient and low thermal conductivity coefficient. IncludedComponents : 1 ItemName : M2 Step Drill Bit Set 3/16" - 7/8”, 1/4" Hex Shank Unibit Step Drill bit,Spiral Grooved for Faster Drilling, Step Bits for Stainless Steel, Wood, Aluminum, Plastic, 12 Step Sizes Taper Drill bit Set ItemPackageDimensions_Height : 9.1948 centimeters ItemPackageDimensions_Length : 2.3114 centimeters ItemPackageDimensions_Width : 2.3876 centimeters ItemTypeKeyword : step-drill-bits Manufacturer : ZANGING Material : High Speed Steel with Cobalt alloy and TiAlN coating ModelNumber : f6ff1c3d-c2cf-46d1-99d3-ce4c985f02ae NumberOfFlutes : 2 NumberOfItems : 1 NumberOfPieces : 12 PartNumber : sdb1 ProductDescription : M2 Step Drill Bit Set 3/16" - 7/8”, 1/4" Hex Shank Unibit Step Drill bit,Spiral Grooved for Faster Drilling, Step Bits for Stainless Steel, Wood, Aluminum, Plastic, 12 Step Sizes Taper Drill bit Set ProductSiteLaunchDate : 2024-09-07T05:39:03.617Z Size : 3/16" - 7/8” SupplierDeclaredDgHzRegulation : not_applicable SurfaceRecommendation1 : Stainless Steel SurfaceRecommendation2 : Wood SurfaceRecommendation3 : Aluminum SurfaceRecommendation4 : Plastic UnspscCode : 27111700