Feature 1Wet or Dry Drilling: Coring bit can be applied for both dry and wet drilling to suit your job needs. Start drilling from a vertical position and continue digging deeper. 25/811 Universal Thread: This coring bit has a 5/811 universal thread for easy and quick assembly to a standard fixed coring or handheld drill press. It is also suitable for use with a variety of devices. 3High Drilling Performance: Our coring bit has a clearance hole, highly regular serrations and a concentric shaft design. The nice design gives high drilling performance while maintaining a long service life. 4Corrosion Resistance: The coring bit is made of alloy steel and diamond with excellent craftsmanship, which has high hardness, wear and corrosion resistance. 5Wide Application: Our concrete coring bit is designed for drilling concrete, marble and other materials in conditions such as installation of pipes, stair railings, highways and airports. Item Type: Diamond Core Drill BitMaterial: Alloy steel, diamondTotal Length: Approx. 410mm/16.1inThread: 5/811 Package List 1 x Diamond Drill Bit1 x Positional Drill Bit1 x Hex Wrench1 x Saw Blade1 x WasherNoteManual measurement, based on the actual size. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin