... carbide inserted tricone bit),both of which are used for mining pilling, water well drilling or oil well drilling2,Model: ... rubber o-rin provides adequate sealing for bearing durability .5.size and model we can provide: 60mm,65mm,76mm, ... 118mm,120mm,127mm(5”)130.1mm(5 1/8”),133.3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8”),149. ... 2mm(5 7/8”)152.4mm(6 ...