1、Excellent Materials: This diamond core drill bit is composed of premium alloy steel components and excellent diamond abrasive grains, with 10.6in drill length, ensures longer core life. 2、Standard Thread: Featuring 5/8‑11 universal thread, this core bit can be easily and quickly assembled to a standard fixed or hand held drill machine, which is applicable to various devices. 3、High Performance: The drill bit is designed with chip removal holes, highly regular saw teeth and concentric shaft, enables high drilling performance while maintaining a long service life. 4、Wet and Dry Drilling: Core drill is available for both dry and wet drilling to suit your job needs, a small amount of water can extend the lifespan. 5、Wide Usage: Can be used to drill concrete, red brick, marble and other materials when air conditioner installation, plumbing installation, stair railing installation, highway and airport, etc. Item Type: Diameter Core Drill Bit Material: Alloy Steel, Diamond 1 x Diameter Core Drill Bit 1 x Positioning Drill Bit 1 x Hex Wrench 1 x Saw Blade 1 x Washer