... It’s mainly used for medium hard to hard and highly abrasive formations.International standard Q,T series Impregnated ... 84223223223223Note: Diamond shoes bit, Q series diamond core bit and reaming shells are also available.LD specializes in kinds ... shells, impregnated diamond casing bit, casing shoe bit, diamond reaming shell, corelifter, corelifter case, diamond sub-adapters, hoist plugs, tap, ...