Twist-a-Nut Pro Screwdrivers are designed especially for the professional electrician. Features patent pending Accu-Loop wire looping holes in handle and wire connector wrench in handle that eases installation of twist-on-connectors. These screwdrivers are of complete professional quality with precision hand filed tips for accurate fit, vapor-blasted tips preventing plate chipping, and chrome vanadium steel shanks for toughness.