Wheeler's F.A.T. Wrench (Firearm Accurizing Torque) brings perfect consistency to every screw on your rifle! This amazing handheld torque wrench lets you apply repeatable, accurate torque settings to scope rings, guard screws, and other screws, which aids in accuracy and decreases the opportunity for problems in the field. The FAT Wrench is a perfect compliment to the Deluxe Gunsmithing Screwdriver Sets. Together, they can ensure accurate tightening of most every screw on any gun in your collection.