Features 1、Reliable Work: Designed to have 102mm diameter and 450mm length, the core drill bit supports both dry and wet drilling for the work. 2、Broad Utility: Can be widely used in drilling concrete, brick, marble and and other materials for installation, plumbing and so on. 3、Better Design: Featuring highly regular serration and concentric shaft design, the core drill bit enables stable working performance. 4、Good Material: Adopting premium diamond material, the core bit with a sturdy structure has excellent durability for long term use. 5、Great Fitting: Comes with universal 1-1/4in thread, the drill bit can be easily installed to stationary coring or hand held drill. Specification Item Type: Diamond Core Drill Bit Material: Alloy Steel + Diamond Diameter: Approx. 102mm / 4.02in Package List 1 x Diamond Core Drill Bit