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Shock subs are blast hole drilling tools engineered to absorb the vibrational impact of surface mining. By protecting the drive heads and mast from the damage caused by axial and torsional shock vibration, the shock sub prolongs the life of drill components, improving the run length and keeping downtime to a minimum. It also holds the drill bit in place, allowing a better penetration rate while protecting the expensive motor from bounce-out damage. All of this translates into a lower drilling cost per foot and a more productive operation.