Smart drive 90 is an advanced gunsmithing driver set.The main driver features a magnetic bit holder rubber grip jewelers spin top & 360 led light.It partners with the small close quarters driver to create force assist.Force assist is a proprietary system that helps users to loosen frozen-in-place screws as well as precisely tighten screws.Type: Gunsmithing KitHandle Description: RubberCase: Hard Carry Case