... BKF24, BKF30, BKF40, BKF45, BKF41, BKF42, BKF24H, BKF49H etc. Coal mining Bits Changzhou Balance Machinery Co.,Ltd offers all kinds of ... underground mining and surface mining for Trenching machine. Our trenching bits could install on ... bit systems to achieve productivity levels and reduce down time. Mining cutter code: U82, U84, U92, U94, U135, U170, U47, ...