Package:3 1/2" core drill bit *1 ; 3/8inch Hex Shank Adapter *1 and 5/8"-11 Thread Male to SDS Plus Shank for SDS Plus Drills *1 Diameter: 3 1/2"/89mm , Inside barrel depth(drilling depth): 10"/254mm,Thread Type: Industry Standard 5/8-11" Versatile Uses: Our concrete core drill is designed for drilling concrete, red brick, tile masonry，brick and cinder block wall，asphalt, rock and other materials on conditions, such as installing air conditioners, pipes,range hood etc. Simple Operation: This core drill best be used dry . Start drilling at the vertical position and continue to dig deep. Efficient & Smooth Drilling: This diamond core drill comprises premium stainstell components, and high-quality diamond grits ensure longer coring life，and features chip removal holes, highly regular sawteeth, and concentric axes design. The SALI Diamond Core Drill Bits are designed for efficient and smooth drilling into various materials such as concrete, red brick, tile masonry, brick, cinder block wall, asphalt, marble, rock, and stone. This 3 1/2"/89mm diameter drill bit features an inside barrel depth of 10"/254mm and an industry-standard 5/8-11" thread type. The package includes one 3 1/2" core drill bit, one 3/8inch Hex Shank Adapter, and one 5/8"-11 Thread Male to SDS Plus Shank for SDS Plus Drills. Made with premium stainless steel components and high-quality diamond grits, these core drills ensure longer coring life. The highly regular sawteeth, chip removal holes, and concentric axes design make the drilling process efficient and smooth. These core drill bits are recommended for concrete, brick, masonry, and are best used dry, starting at a vertical position and continuing to drill deep.