Specification Brand : Driak BulletPoint1 : 5PC Hss Hole Cutter Step Drill Bit Set With Aluminum Case BulletPoint2 : 3-sided shank prevents slip in drill chuck.Different sized shanks ensure compatibility with 1/4, 3/8 and 1/2 in. chuck sizes. BulletPoint3 : Drill tip provides fast and smooth drills on steel sheets, aluminum sheets, wood board, plastic board etc. (the board must be smaller in thickness than the height of step drill bits). BulletPoint4 : Size: #1: 3/16" to 1/2"/5-13mm.#2: 1/8" to 1/2"/3-6mm.#3: 1/4" to 3/4'' /7-9mm.#4: 1/4" to 1-3/8"/7-35mm.#5: 3/16" to 7/8" 5-22mm BulletPoint5 : Includes a protective aluminum case to make the drills not easy to dull. Cobalt added reduces friction and lasts longer than those which does not contain cobalt bits. BulletPoint6 : COMPATIBLE WITH VARIOUS DRILLS - 1/4"(6.35mm) Hex shank design eliminate slipping in drill chuck, these step drill bit for metal are compatible with a range of drilling tools including bench drills press, impact drills, and hand drills, making them a versatile addition to your toolkit. BulletPoint7 : KIND TIPS - To prevent overheating and potential damage to the drill bits, always use cutting oil or spraying water during operation. Proper cooling extends the life and efficiency of the bits. Color : Gold CuttingAngleString : 30 degrees ExternallyAssignedProductIdentifier1 : 710280453334 ExternallyAssignedProductIdentifier2 : 0710280453334 ExternallyAssignedProductIdentifier3 : 0045242307777 ExternallyAssignedProductIdentifier4 : 0826659234821 ExternallyAssignedProductIdentifier5 : 00045242307777 FinishType : Titanium GpsrSafetyAttestation : 1 IncludedComponents : Step Drill Bits ItemName : Driak 5Pcs Inch HSS Step Drill Bit Triangle Pagoda Drill Titanium Cone Drill Hole Cutter Drill Bit with Aluminum Case ItemPackageDimensions_Height : 16.3 centimeters ItemPackageDimensions_Length : 4.7 centimeters ItemPackageDimensions_Width : 12 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : step-drill-bits Manufacturer : Driak Material : High-Speed Steel Material1 : High Speed Steel Coblat M35 Material2 : TiAlN Coating ModelNumber : DRK-55010086 NumberOfFlutes : 2 NumberOfItems : 1 NumberOfPieces : 5 PackageLevel : unit PartNumber : DRK-55010086 ProductDescription : Specifications: Material:High Speed Steels Item Type:Step Drill Features: All the bits come in a well-organized case for easy transport and storage. Double cutting blades design enables a faster and smoother cutting. The sharpness and titanium coating ensure easily cut through most sheet metal,plastic and of course wood and some other materials with ease. Please mark the spot that you are to drill for easier drilling and improved drill bits life. Cobalt high speed steel along with the titanium coating ensures extreme durability, will stay new and shiny for years to come. High speed steel for longer service life. Automatically deburrs holes while drilling 3-sided shank prevents slip in drill chuck