Pieces: 15. Content: Combination wrenches 1/4″, 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, 7/8″, 15/16″, 1″, 1 1/16″, 1 1/8″. Made of chromium-vanadium steel, 12 lobular design tips. Finish: Mirror-polished. Great resistance to torque. It distributes stress and avoids damage to the nuts. Great resistance to corrosion, easy to clean.