PDP P5-EDDC Dry Core Drill Bit 158 x 400mm with BSP Female Thread (½") DC12715The EVODRILL is a high quality dry diamond core for use on hard materials such as concrete with hard aggregate, clay products, Indian sandstone and natural stones, regular building materials such as standard house bricks, concrete blocks, breeze blocks, handmade bricks, building blocks and York stone. EVODRILLS can be used on rotary and percussion action (not hammer action). The combination of the rotational function and subtle pulsing from the