Set contains one piece impact hex drivers in sizes 1/4″ to 3/4″ and 6mm to 18mm. 1/4″ 2908F 9/32″ 2909F 5/16″ 2910F 3/8″ 2912F 7/16″ 2914F 1/2″ 2916F 9/16″ 2918F 5/8″ 2920F 11/16″ 2922F 3/4″ 2924F 6mm 2906M 7mm 2907M 10mm 2910M 12mm 2912M 14mm 2914M 15mm 2915M 17mm 2917M 18mm 2918M.