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Shale is a fine-grained, clastic sedimentary rock composed of mud that is a mix of flakes of clay minerals and tiny fragments (silt-sized particles) of other minerals, especially quartz and calcite. Your additive chemistry is going to really come into play when drilling with this stuff so make sure you mud guy had a good night's sleep and hearty breakfast!
Configure a pullback device to work with any Borzall bit.