Casing Shoe, set with diamond, fix casing or rod. Ensure the internal diameter is sufficient for smaller standard drilling tools to pass through.
>>Threaded with casing or drill rod.
>>Tightly sitting on the bedrock, make sure drilling fluids through to the ground.

Wireline Series: BQ,NQ,HQ,PQ,RW,EW,AW,BW,NW,NWT,HW,HWT,PW,PWT,SW,UW,ZW,NT,HT,PT,BWS,NWS,SZ,BTW,NTW,HTW

Metric Series: 46,56,66,76,86,101,116,131,146

X Series： RX,EX,AX,BX,NX,HX,PX,SX,UX,ZX