Profile: Bit Brokers International offers rotary tricone drill bits, new/unused surplus tricones, hammer bits, rebuilt tricones, custom built hole openers, drag bits, cutters, adapter subs and stabilizers. Our BB74 is designed to drill hard and abrasive formations such as quartzite, granite, cherty iron ores and copper porphyry. Our BB63 is designed for medium hard formations, which is semi-abrasive such as hard, sandy limestone, shale, dolomite and limestone with cherty streaks.