... cone tooth bits 3-26 inch tricone rock roller bit by ISO9001&API best bearing system 20 ... years history Milled Tooth Rock Roller Bits: 7 7/8 to 14 1/2 ... to 26”larger sizes for hole opener bit ,reamer bitadvantagemost favourable price and best qualtitybearing type:sealed bearing ... Tricone bits,steel tooth bit,milled tooth , rock roller bit,tricone bit,tungsten carbide insert rock bit,tri ...