OX Ultimate Universal Dry Diamond Core Drill Bricks, Blocks, Concrete, 22mm-182mm. The fastest core on the market guaranteed, will even drill hard concrete. With laser welded segments for ultimate strength the BZX is an incredibly versatile core, drilling almost anything including engineering and concrete. APPLICATIONS: all house bricks, engineering bricks, concrete blocks, general building materials, concrete, natural stone. Available in Sizes from 22mm to 182mm.