... ”),155.5mm(6 1/8”),158.7mm(6 1/4”), 165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 ... 1/2”),406.4mm(16”)444.5mm(17 1/2”),508mm(20”),558mm(22”),609.6mm(24”)660.4mm(26”)Available models: Steel tooth(IADC ... ,136,137 216,217, 227211,311TCI(IADC)415,435, 417,437515,525,535,545, 517,527,537,547615,625,635,,617,627 ...