24 Jan 20890
We drill a lot of 4.5 in to 5.5 in holes and for the last several years we are using DTH because the bearings kept going out on the smaller bits .On the 6/34 in we had no problem but we also went to hammer on those also, But we give up a lot of footage bye the end of the day . Our rock is mostly limestone about 15000 to 18000 psi. How will these bits work and the price please. Thanks Floyd Summers
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