The Real Avid Smart Drive 90 is an advanced Driver Set for the at-home gunsmith, and comes with a main driver with magnetic bit holder and a 360 degrees LED light that shows you what you're working on. It also includes a smaller driver that fits inside the main driver to provide Force Assist for loosening stuck screws and for precisely tightening. Features: Includes 87 standard and metric black oxide-coated bits Includes a main driver with magnetic bit holder, rubber grip and 360 degrees LED light Includes a smaller driver that fits into the main driver to provide Force Assist for loosening screws Includes a scope turret tool Bits are hollow-ground/square-cut from S2 tool steel to apply maximum force to all surfaces of the screw to prevent marring or slippingBits: 3mm Group (9 bits): 0.5mm-1mm thickness 3.8mm Group (4 bits): 0.7mm-1mm thickness 4.7mm Group (4 bits): 0.6mm-.9mm thickness 5.4mm Group (10 bits): 0.4mm-1.2mm thickness 6mm Group (7 bits): 0.6mm-1.2mm thickness 7mm Group (9 bits): 0.6mm-1.5mm thickness 7.6mm Group (5 bits): 0.8mm-1.5mm thickness 8.6mm Group (6 bits): 0.7mm-1.6mm thickness 9mm Group (6 bits): 0.8mm-1.8mm thickness Order today!