CIR90A-95CC 95mm Concave Face Ballistic Button DTH Drill Bit The CIR90A-95CC 95mm Concave Face Ballistic Button DTH Drill Bit is designed for efficient down-the-hole rock drilling in mining, quarrying, construction and rock excavation applications. Featuring a concave face design with ballistic carbide buttons, this DTH button bit combines effective impact energy transfer, good hole control and efficient flushing performance. The 6x14mm + 6x12mm carbide button configuration