... 241mm),9 5/8"(245mm), 11 5/8"(295mm),12 1/4"(311mm), 13 5/8"(346mm),14 3/4"( ... 1/2"(445mm),18"(457mm), 26"(660mm)Model NO.437,447,517,527,537,547,617,637,737IADC CODE116,117,126, ... 127,136,137,216,217,316,317,346,347RPM(r/min)140~60WOB(KN/mm)0.35~1.0Thread ... different tooth shape, tooth density and tooth exposure height. 17 1/2" milled tooth tricone bits for well drilling mine drilling