Alloy steel sockets and shafts. Ergonomic soft grip handles for comfort. Color coded for easy identification. Designed to perform consistently and withstand even the most heavy duty applications. Sets packaged in handy plastic hanging organizer 7 piece professional fractional nut driver set includes sizes: 3/16" x 3", 1/4" x 3", 5/16" x 3", 11/32" x 3", 3/8" x 3", 7/16" x 3" and 1/2" x 3". Rugged and designed for shop environments, tools feature hollow shaft. Available individually.