This is Du-Bro's Threaded Stud Driver. FEATURES: Silver metal construction. This unique tool takes the hassle out of threaded studs & threading threaded rods into plastic push rods. Each end is threaded differently. Diamond grooved and textured for a better grip. It's fast & easy! No more damaging threads with pliers! INCLUDES: (1) Stud Driver REQUIRES: Stud/Rod SPECS: Thread Sizes: 2-56 4-40 Overall Length: 16mm (.63") kr3/14/03BOX DIMENSIONS: 2.13" W. X .38" H. X 2.25" L.BOX WEIGHT: .01 LBS.