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Jan 21, 2018 · the first steps to good performance and service life when drilling with dth equipment is to have a balanced system – air supply, hammer and bit; the picture below left one is bad balanced system which will lead to low penetration rate, and right one is good balanced system with perfect penetration rate . correct settings

It is a kind of self drilling anchor bolts. it is a new and high technological supporting product which combines drilling, grouting and anchoring together. the bolt length is flexible, it can be lengthened according to your demands.

Supanchor r32 anchor bar coupling for rock anchoring. features . supanchor® self drilling anchor system is a bolting solution for difficult ground and rock conditions. the system enables drilling and grouting in one operation, making much saving in jobsite and project time. applications . tunnelling ground engineering. 1.

Nq drill rod priceselect 2020 high quality nq drill rod price products in best price from certified chinese water well drill rod manufacturers, thread drill rod suppliers, wholesalers and factory on made-in-china

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