Hello I'm Griffin barring product manager for Crescent tools and this is one of our latest innovation the quick convert nut drivers Center these drivers give you the speed of a straight handle and the torque of a t-handle all in a single tool to convert just pull the shaft rotate the handle and push to lock in place it's quick easy and most of all extremely efficient each driver features a universal socket that fits six fastener types in both standard and metric there simply is no better tool value one crescent quick convert set replaces for traditional driver sets a hollow corrosion resistant polished chrome shaft accesses fasteners over long bolts the dual material cushioned handle provides a non-slip grip and resists oil and grease the Crescent quick convert nut driver set includes seven drivers color-coded for easy identification speed torque one tool that's Crescent innovation