10 piece metric combination wrench set. Chrome Vanadium Alloy Steel for long lasting durability. Surface Drive® technology on box-end virtually eliminates fastener rounding. Heat treated for maximum strength. Sizes stamped on both sides for easy identification. Nickel Chrome plated for long lasting protection. Mirror polish finish. Set includes: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 17 mm, 19 mm and storage rack.