RC DrillingHammer and Bit for down-the-hole drilling air reverse circulation drilling. High Pressure RC Drilling bit Bit for down-the-hole drilling, ... , water well drilling, geothermal well drilling, reverse circulation drilling.Bit Front designs:Complete compatible to be used with DHD hammerDHD330 ... Convex Front, Flat Front, Concave Front, Concave DGR Front etc.Bit Dia. RC Drill Hammer and Bit