A tool assembly with a driving tool and a holder assembly. The driving tool has a housing, a motor, an output member and a transmission for rotatably coupling the output member to the motor. The motor and the transmission are housed in the housing. The holder assembly has a leg, which is telescopically coupled to the housing, a fastener guide and an adjustment mechanism. The fastener guide includes a longitudinally extending groove that is configured to support a threaded fastener and a cam that is disposed transverse to the groove. The adjustment mechanism couples the fastener guide to the leg on a side of the leg opposite the housing. The adjustment mechanism is configured to vary a distance between the groove and a rotational axis of the output member.