... Plywood box, steel box, or as your requirements Payment Term T/T or L/C at ... well drilling or oil well drilling2,Model: various kinds and according to the requirements of customers3,Material: ally steel, ... Information:wooden box, steel box or as your requirements Model 6-17 1/2(inch)Type tricone bits, ... adequate sealing for bearing durability .5.size and model we can provide: 60mm,65mm,76mm,93mm,95mm ...