hole opener Horizontal Hole Openers, also known as HDD Reamers, are used to enlarge the pilot hole inHorizontal Directional Drilling
pilot bits Formations: long intervals of very soft poorly compacted shales ,sandstone, clays, salts and soft li mestones. Size and
steel teeth roller cones pilot bit our company can supply all kinds of tricone bits to you for hole drilling.All bits have high quality and low price.118--
