We Offer custom options, making sure peak general performance and extended service life for your assorted drilling wants. Kelly Bars/Rods: Although usually regarded as different from drill rods, a “square kelly�?or “hexagonal kelly�?is really a critical ingredient at the very best from the drill string in rotary drilling, transmitting rotational https://www.tumblr.com/northstardrill/829158953258778624/our-promo-video-for-mining-metals-central-asia