The lifting plug is a special tool for lifting of drilling tools in petroleum,nature gas,drilling engineering and geographical exploration. The lifting plugs are available in integral type and circular type. 
Technical parameters and specifications 
 
| Thread connection | 
O.D. (mm) | 
Thread connection | 
O.D. (mm) |  
| 7 5/8REG(pin)  | 
 210 | 
NC31(pin) | 
 100 |  
| 6 5/8REG(pin) | 
 190 | 
NC26(pin) | 
 89 |  
| 5 1/2FH(pin) | 
 178 | 
2 3/8REG(pin)  | 
 80 |  
| NC50(pin) | 
 155 | 
3 1/2EUE  | 
 95 |  
| NC46(pin) | 
 150 | 
2 7/8EUE | 
 80 |  
| NC38(pin) | 
 115 | 
  | 
  |    |