Pedro's Ratcheting Combo Wrench Set Material: hardened steel Open End Wrench: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm Box End Wrench: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm Recommended Use: repairing bikes Manufacturer Warranty: lifetime