Available roller cone with sealed bearing or Metal sealed bearing.All our hole openers and rock reamers can be supplied with a widerange of cutters to deal withsoft rock ike limestone or sandstone, right up to hard formation bits capable of drilling in Granite and Basalt. Correct cutter selection allows highter productivity and tool life. The nozzles can be designed according to different reamer size on different drilling conditions. Our rock reamer can be custom build with 3,4,5or more rollers, depend on your pullback power and the diameter of the pipe.Our hole openers are generally fitted with API threads,IF,FH,etc