Specification Brand : BGTEC BulletPoint1 : diameter 8mm 5/16 Inch,diamond length 10mm,Hex Shank Quick-fit BulletPoint2 : Multi-purpose drilling for granite & marble, masonry, concrete, tile/ceramic, stone BulletPoint3 : Wax inside for cooling,our Diamond Tipped Drill Bits have wax cores built-in which automatically absorb and dissipate heat as you go BulletPoint4 : Dry drilling and Use water for longer time.Notice:Please use with water when drilling granite BulletPoint5 : Vacuum Brazed diamond technology provide very high efficiency,cuts faster and lasts longer. Diamond material upgraded, can drill 10-15 more holes than ordinary drill bits. Color : Orange CuttingAngleString : 45.0 degrees ExternallyAssignedProductIdentifier1 : 769891571425 ExternallyAssignedProductIdentifier2 : 0769891571425 ExternallyAssignedProductIdentifier3 : 00028877449937 FinishType : Brushed GpsrSafetyAttestation : 1 IncludedComponents1 : 3-1/2 X 22IN SDS MAX ONE PC CORE BIT IncludedComponents2 : 3-1/2 X 22IN SDS MAX ONE PC CORE BIT IncludedComponents3 : 3-1/2 X 22IN SDS MAX ONE PC CORE BIT IncludedComponents4 : 3-1/2 X 22IN SDS MAX ONE PC CORE BIT IncludedComponents5 : 3-1/2 X 22IN SDS MAX ONE PC CORE BIT ItemName : BGTEC Dry Diamond Drill Bits 5pcs 5/16" with Quick Change Hex Shank Granite Marble Porcelain Tile Ceramic ItemPackageDimensions_Height : 10.0076 centimeters ItemPackageDimensions_Length : 1.7018 centimeters ItemPackageDimensions_Width : 8.1026 centimeters ItemPackageQuantity : 5 ItemShape : Rectangular ItemTypeKeyword : core-drill-bits Manufacturer : BGTEC Material : Artificial diamond and Steel body Material1 : Blend Material2 : Blend Material3 : Blend Material4 : Blend Material5 : Blend ModelNumber : DBT2208U5 NumberOfFlutes : 2 NumberOfItems : 1 NumberOfPieces : 2 PackageLevel : unit PartNumber : DBT2208U5 Pattern : Solid ProductDescription : Product Name: Hex Shank Quick-fit drilling bits Color: Orange. Application : Dry drilling for granite & marble, masonry, concrete, tile/ceramic, stone..... Specification: Hex shank Quick-fit , available diameter 6mm 1/4", 8mm 5/16", 10mm 3/8", 12mm, 14mm, diamond length 10mm 3/8" Feature: 1.Wax inside for cooling, Dry drilling 2.Vacuum Brazed diamond technology provide very high efficiency, multi-purpose drilling 3.Long life drilling Quick Tips 1.Place the drill at a 45 degree angle 2.Drilling till the hole start to form 3.Bring the drill up into upright position 4.Continue to drill and swaying the machine along a circle