Drilling power pliers: divided into drill pipe power pliers and casing power pliers. The drill pipe power pliers are usually called liquid gas pliers.

The model number is as follows:

• Power pliers category code: ZQ means drill pipe power pliers; TQ means casing power pliers; XQ means shaft power pliers.

• Bind type code: unmarked indicates open type; B indicates closed type; H indicates live type.

• Clamp clamping method code: unmarked means inner climbing clamping; W means outer climbing clamping; X means planetary claw clamping.

• Drive mode code: Y means hydraulic; Q means pneumatic; not marked means liquid and gas combined drive.