Specification Brand : NDNCZDHC BulletPoint1 : [High Drilling Performance] Our core bits feature chip evacuation holes, highly regular serrations and a concentric shaft design for high drilling performance. BulletPoint2 : [Universal Thread] This coring bit has a G1‑1/4in universal thread and can be easily and quickly assembled to a standard fixed coring or hand held drill press. It also works on various devices. BulletPoint3 : [Dry or Wet Drilling] Core drills can be used for both dry and wet drilling to suit your work needs, and a small amount of water prevents the drill from overheating and prolongs its service life. BulletPoint4 : [Alloy Material] This diamond core drill bit is composed of high hardness alloy steel components, and diamond abrasive grains ensure longer core life. BulletPoint5 : [Main Application] The diamond core drill can be used to drill concrete, red brick and marble under the conditions of installing air conditioners, pipelines, highways and airports. FinishType : Finished ItemName : Diamond Core Drill Bits G1‑1/4in Concrete Drill Bit 17.7in Length 5in Diameter Drill Bit Alloy Steel Core Bit for Dry Wet Drilling ItemPackageQuantity : 1 ItemTypeKeyword : core-drill-bits Manufacturer : NDNCZDHC PartNumber : NDNCZDHCm97rzbw3ef ProductDescription : Specification: