The Marcrist WCU850X is a top of the range diamond wet drilling core designed to be used on a range of surfaces from Plasterboard to Granite and Natural Stone. This core is said to be Marcrist's most universal professional cores ever. The connection to this core is 1 1/4 inch UNC (F). High concentration segment and cobalt bonds are some of the many reasons as to why this diamond drilling core produces the highest quality results. Specifications • Diameter: 162mm • Length: 450mm Features and Benefits • Low drilling costs per hole • Rooftop segment for easy start and minimum run off • High concentration segment for exceptional life • Cobalt bond for fast drilling speed • Precision balanced core for precision