... Bits 415 Soft Formation TCI Tricone Bits1)The FL 415 tci bits are used to drill low ... Bits 535 Medium Formation TCI Tricone Bits1)The FL 535 features aggressive chisel tungsten carbide inserts on ... Available Size: 6",6 1/2",7 1/2",8 1/2",9 1/2",9 5/8",9 7 ... and seizure resistance of the bearing are improved. 2.Premium O-ring, Optimal seal compression and ... ",6",6 1/2",7 1/2",7 7/8",8 1/2",9 1/2",9 5/8", ...