107mm in diameter x 450mm Length Perfect for Fan installations on Deep walls, No need to keep stopping, to knock the bricks out of the core Head, Do it all in 1 go. Connection 1 ¼, Screws onto Core drills. Market Leading Quality & Performance, Highly reinforced concrete, all building materials, natural stone. Our most universal professional core ever 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 Can Be Used With? Dimond Core Drill, Drilling Rigs Suitable For? Block Pavers, Blockwork, Building Materials, Cast Concrete, Class A Engineering Bricks, Class B Engineering Bricks, Concrete, Concrete Pipes, Extreme Reinforced, Extremely Hard Building Materials, Facing Bricks, Granite, Hard Concrete, Indian Sandstone, Lignacite Blocks, Masonry, Natural Stone, Plasterboard, Prestressed Concrete, Reinforced Concrete, Sandwich Materials, Unreinforced Concrete.