Twist-a-Nut™ Screwdriver is designed especially for the professional electrician. It measures 1/4 Inch x 4 Inch and is made of chrome vanadium steel shank blade. Tip features patent pending Accu-Loop™ wire looping holes in handle and wire connector wrench in handle that eases installation of twist-on-connectors. It has precision hand filed tips for accurate fit and vapor-blasted tip prevents plate chipping.