使用M/F扩展钻头钻孔的优点包括:易于处理,更快的解偶联,更紧密的连接以及钻孔孔的潜力。Used for both surface and underground applications on larger hydraulic top hammers, Prodrill’s Tubular Drill Rod System feature Drill Bits, Shank Adptors and Male/Female Tube Rods available in ST58 and ST68 Threads with bit diameters in the range 89mm-150mm(3 1/2”-6”),also available are Guide Tubes to assist in straight hole drilling on R32 through to T51 Threads, for holes in the size range 54mm to 115mm.