Cross bits,button bits,Rock Drilling,Rock Drill,Cutting tools,chisel bits,drill bits,anchor bits,Steel bits,Furnace taping bits D TYPE STEEL BITSTHREAD CONNECTIONTip Size D D ThreadPart No.Inch1-3/4D30 1-1/50 SFS45D301-7/8D30 1-1/50SFS48D302D30 1-1/50SFS51D302-1/4D30 1-1/50SFS57D302-1/2D30 1-1/50SFS64D302-3/4D30 1-1/50SFS70D303D30 1-1/50SFS76D30 D Thread type full steel Cross bits