... tooth bits, insert tooth bits, roller bits, drill bits, drilling tools etc. we have been in line with the principle of ... ”),161.9mm(6 3/8”),165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 7 ... /8”),295.3(11 5/8”)311.1(12 1/4”),346.0 (13 5/8”),349.2(13 3/4”)374.6(14 3 ... /4”)381(15”),393.7(15 1/2”),406.4(16”)444.5(17 1/2”),508 ...