The Bumper Sub’s design always allows full torque and unrestricted fluid circulation. The Logan Fishing Bumper Sub can bump up or down to engage or disengage overshots or spears or be used as a feed-off tool in milling or cutting operations. Other typical operations include releasing stuck drill pipe, drill collars, tubing, test tools, and safety joints. The fishing bumper sub can be used in conjunction with an overshot or spear.