The Lyman ProDrive Torque Wrench is a must for accuracy minded shooters and gunsmiths! The Lyman ProDrive Torque Wrench will allow you to safely and correctly attach scope bases, scope rings, action screws and other fasteners to firearms. Correct screw torque prevents damage to screw threads, screw heads, threaded surfaces and optics. Consistent screw torque will also help get the best accuracy from your firearm.