A hand tool system comprises a first driver, a second driver, and a driver adapter. The first driver and the second driver each comprises a driver handle having an external configuration and a driver component secured to the driver handle. The driver adapter is selectively fittable over the driver handles of the first and second drivers. The driver adapter comprises an elongate body, a first socket formed in a first end of the elongate body, a second socket formed in a second end of the elongate body, and a plurality of through holes formed through and distributed longitudinally along a length of the elongate body. Each socket has an internal configuration sized and shaped to receive a driver handle of either the first or second driver and to transfer torque to the driver upon rotation of the driver adapter.