Smart Drive 90 is an advanced gunsmithing driver set. The main driver features a magnetic bit holder, rubber grip, jeweler's spin top & 360Adeg 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.Kit IncludesPolycarbonate lidLarge driver with led87 black oxide coated gun bitsSmall driver for tight spacesScope turret toolMagnetic parts traySlide lockSpin top on main driverForce assist technology helps loosen stuck screws and precisely tighten screwsRubberized handles for sure grip"No Shadow" led on main driverHammer surfaceMagnetic tipSmall driver for tight spaces. Doubles as force assist lever87 standard & metric black oxide coated gun bitsHollow ground/square cut slotted tips:3mm Group (9 bits), .5mm-1mm thickness3.8mm Group (4 bits), .7mm-1mm thickness4.7mm Group (4 bits), .6mm-.9mm thickness5.4mm...