3 mm Super-Thin: This spanner set is just 3 mm thin, much thinner than a normal spanner which is usually 10 mm, which makes it easier to reach fasteners in narrow space. Precisely machined for a perfect fit on all fasteners, giving you maximum torque without slippage Quality Spanner: Thin, but strong, not easy to bend. The double open-end spanner set is made of premium carbon steel with a mirror polish finish. Chrome plated for rust resistance, heat treated for maximum strength and long lifespan 8-Piece Set: Sizes of double open end spanner set include 5.5x7 mm, 8x9 mm, 10x12 mm, 11x13 mm, 14x17 mm, 19x21 mm, 22x23 mm, 24x27 mm. Two sizes per wrench provide more options with less to carry. Wrench sizes are stamped on both sides of the handle for easier size identification With Storage Pouch: The spanner set comes with a rolling pouch for convenient storage. The pouch has each spanner size printed for easy organization. There are also two lanyards between the cover and the package for easy hanging Good Choice: Our Super-Thin double open-end spanner set is pretty anti-abrasive and durable. Practical design is widely applicable in industries such as bicycle, motorcycle, car repair repairing and maintenance, household, machinery, and electric power, Weight: 1.3448197982 pounds, Manufacturer: LONGYOU YIYANG IMPORT AND EXPORT CO.,LTD