Heat treated chrome vanadium steel construction provides added strength to reduce wear out, and withstand extended daily use to ensure maximum durability Versatile long / short arm design provides additional reach for deep work spots on the long end and extra leverage for tight fastener on the other short end Comes in a compact and foldable storage case, with size indexed individual slot for each wrench for quick size selection and easy organizing It comes with Fully Heat Treated 48-52 HRC Folding Plastic Holder Packing. Extra Long 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10 Mm | Ball Ends