... 527 537 547, 617 627 637 647, 737, 837 roller bearing 415 435 445, 515 535 ,615 625 635 ... 40Very hardQuartzite, Chert, Basalt Granites, Pyrites etc.795.2-174.63 3/4-6 7/8294-53980-40 Photos ... : 1. Firstly decide the design, material and color 2. Decide the size in accordance with client's requirement ... to bring your dream to reality. hughes 17 1/2"roller cone rotary tools rock drill bit used tci tricone ...