MPACT RATED 3/8-in. x 1-7/8-in. Nut Driver is engineered to withstand the high torque output of an Impact Driver. Featuring an industrial strength magnet which helps to maximize fastener retention, allowing users to complete fastening applications with precision placement. Our recessed corners drive fasteners on the flats, helping to minimize the buildup of metal shavings and reduce rounding of the hex head.