Specification Brand : Xnrtop BulletPoint1 : Cobalt high speed steel along with the titanium coating ensures extreme durability, will stay new and shiny for years to come. BulletPoint2 : Different sized shanks ensure compatibility with 1/4, 3/8 and 1/2 in. chuck sizes. BulletPoint3 : Non-walking 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 : Please mark the spot that you are to drill for easier drilling and improved drill bits life. BulletPoint5 : All the bits come in a well-organized case for easy transport and storage. BulletPoint6 : 【Friendly Reminder】Due to high-speed rotation, the temperature of the drill bit will rise. It is recommended to add cutting oil or spray water to cool the drill bit during continuous operation, which can effectively extend the service life of the step drill. Color : Multi CompatibleFastenerDescription : 0.25 inches CuttingAngleString : 135 degrees DriveSystem : hex ExternallyAssignedProductIdentifier : 4975180580504 ExternallyAssignedProductIdentifier1 : 4013288117632 ExternallyAssignedProductIdentifier2 : 04013288117632 FinishType : Titanium GpsrSafetyAttestation : 1 IncludedComponents : step drill bit ItemLength : 7.5 centimeters ItemName : xnrtop 5pcs Hss Cobalt Multiple Hole 50 Sizes Step Drill Bit Set ItemPackageDimensions_Height : 11.7 centimeters ItemPackageDimensions_Length : 3.6 centimeters ItemPackageDimensions_Width : 10.7 centimeters ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : step-drill-bits Manufacturer : Xnrtop Material : High Speed Steel Material1 : Blend Material2 : Blend Material3 : Blend Material4 : Blend Material5 : Blend MeasurementSystem : Metric ModelName : 05104672001 ModelNumber : 12-009 5pcs NumberOfBoxes : 1 NumberOfFlutes : 2 NumberOfItems : 1 NumberOfPieces : 1 PackageLevel : unit PartNumber : 12-009 5pcs Pattern : Solid ProductDescription : xnrtop step drill bits set replaces 50 individual drill bits in 5 pieces step drill bits, which saves you a lot of trouble and space. Two-fluted design provides faster and smoother cutting. Cobalt steel along with titanium coating ensures this set with outstanding durability and will stay sharp for years to come, perfect to cut holes on sheet metal, aluminum sheets etc. A well-organized box provides users with easy storage and transport, truly a must-have for DIY lovers and HVAC professionals. step drill bit Care Tips Not compatible with hammer drill. Please do not set drilling speed too high to avoid damages to cutting edge. It is recommended to oil the bit before every use. Please drill a smaller hole to make drilling smoother. The material on which you want to drill should not exceed 0.12 in. in thickness. Advantages of HSS Step Drill Bits Drills holes of various sizes without changing bits. Minimal shocks and almost impossible to snap compared to conventional bits. Smooth hole edges, perfect to drill holes for HVAC jobs. Smoother and rounder holes. Prevents metal scurf from flying around for improved safety.