The Klein Tools Conduit-Fitting and Reaming Screwdriver Can Ream and Smooth 1/2'' (13 MM), 3/4'' (19 MM), and 1'' (25 MM) Thin-Wall Conduit. It Features A Hooded-Blade Design That Keeps The Screwdriver Tip From Slipping Out Of Screws, Which Is Especially Handy When Tightening Hard-to-Reach Conduit Fittings. This Screwdriver Has A Longer Cushion-Grip™ Handle For Even More Comfort and Torque While Reaming.