Specification Brand : Driak BulletPoint1 : 3pcs 16-30.5/5-20/3-14mm HSS 6542 Umbrella Chamfering Cutter Step Drill Bit Set BulletPoint2 : size:16-30.5mm/0.62"-1.2",10mm Handle Dia. 2.6-20mm/0.1"-0.79", 8mm Handle Dia.3.3-14mm/0.13"-0.55", 6mm Handle Dia. BulletPoint3 : Unique umbrella structure, a drill can open a variety of sizes aperture. BulletPoint4 : Using 4241# high speed steel, easy drilling, high hardness, sharp edge, good cutting effect. BulletPoint5 : Deburring, chamfering and round hole reaming are done at one time with little shaking Color : Yellow CuttingAngleString : 135 degrees ExternallyAssignedProductIdentifier1 : 782337034025 ExternallyAssignedProductIdentifier2 : 0782337034025 FinishType : Titanium,Gold ItemName : Driak 3pcs 16-30.5/5-20/3-14mm HSS Titanium Plating Taper Umbrella Drill Bit Umbrella Chamfer Chamfering Cutter Step Drill Bit Set ItemPackageDimensions_Height : 12.6 centimeters ItemPackageDimensions_Length : 3.3 centimeters ItemPackageDimensions_Width : 10.8 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : step-drill-bits Manufacturer : Driak Material : High Speed Steel NumberOfFlutes : 2 NumberOfPieces : 3 ProductDescription : Features: - Unique umbrella structure, a drill can open a variety of sizes aperture. - Does not require the use of a center punch, and is less likely to break than a regular twist drill. - Deburring, chamfering and round hole reaming are done at one time with little shaking. - Using 4241# high speed steel, easy drilling, high hardness, sharp edge, good cutting effect. - Gold titanium plating process is not fade, not easy to scratch.