Feature 15/811 Universal Thread: This core drill has a 5/811 universal thread for easy and quick assembly to a standard fixed core or hand held drill press. It also works on various devices. 2Innovative Design: Our diamond wet core bits feature chip evacuation holes, highly regular serrations and a concentric shaft design. 3Alloy Steel, Diamond: This diamond core drill is composed of excellent alloy steel components, and diamond abrasive grains ensure longer core life. 4Dry and Wet Drilling: Core drills are available for both dry and wet drilling to suit your job needs. Drill holes from a vertical position and add a little water can extend the life. 5Scope of Application: Our core drilling bit is used to drill concrete, red brick, marble and other materials for installations such as air conditioning, plumbing, stair railings, highways and airports. Item Type: Wet Diamond Core Drill BitMaterial: Diamond, Alloy SteelTotal Length: Approx. 240mm/9.5in Package List 1 x Wet Diamond Core Drill Bit1 x Positioning Drill1 x Hex Key1 x Saw Blade1 x WasherNoteManual measurement, the actual size shall prevail