1.good quality and lowest price 2.different type matched different type of kelly bar    They are have good efficiency and lowest price,  which have different specification, and matched all kelly bar..We can produce different...

1.Designs uniquely novel 2.the bearing pressure bearing completely selects import 3.good quality and using long time      kelly bar drive head and upper fitting,which uses bearings to rotate kelly bar and prevent steel wire rop...

1,Designs uniquely novel 2,the bearing pressure bearing completely selects import 3,good quality and using long time      kelly bar drive head and upper fitting,which uses bearings to rotate kelly bar and prevent steel wire rop...

1.Designs uniquely novel 2.the bearing pressure bearing completely selects import 3.good quality and using long time      kelly bar drive head and upper fitting,which uses bearings to rotate kelly bar and prevent steel wire rop...

1.upper fitting of kelly bar to joint the drilling bucket 2.producing different type to match different type of kelly bar      It is kelly bar drive head and upper fitting, which  is used to joint the drilling bucket or...

1,good quality and reasonalbe price 2,having enough intensity and durability 3.use: kelly bar      Damping spring is for kelly bar accessories,it assumes spiral-shaped,the elasticity is strong ,each different type of spring is suitable...