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

1.Our high quality teeth and holders will help to improve working efficiency. 2.made of manganese steel      Our high quality teeth and holders will help to improve working efficiency.Drilling rig's cutting tooth including bucket tooth and bullet tooth. Bucket...

1.high quality and competitive price 2.transmissing the pressuring force best 3applied to the hard layer and high efficiency    Full interlocking pressurizing kelly bar is also known as concave-convex Kai-type pressurizing kelly bar.    It is ...