... improved with new formulas and new techniques for insert bit. 2). Gauge StructureMultiple gauge protection with gauge ... sizes: 60mm,65mm,76mm,93mm,95mm,98mm(37/8”),101.6mm,114mm,118mm,120mm,127mm(5”)130.1mm ... (5 1/8”),133.3mm(5 1/4”),139.7mm(5 ... 193.6mm(7 5/8”),200.0mm(7 7/8”)212.7mm(8 3/8”),215.9mm(8 1/2”),222. ... .4(9 5/8”),250.8(9 7/8”)269.8(10 5/8”),295.3(11 5/8”)311.1(12 ...