Forged from high quality chrome vanadium steel with mirror polish treatment on the surface, high hardness and corrosion resistance. Torque meets DIN3113 standard. Full-drive box ends deliver reliable torque to tighten or loosen bolts without rounding. [Superior Quality] – Forged from high quality chrome vanadium steel with mirror polish treatment on the surface, high hardness and corrosion resistance. [20Pcs SAE & Metric Sized Wrenches] – This wrench set include 10pcs Flex-head wrenches and 10pcs Fixed head Wrenches. There are the most common used sizes: includes 1/4″, 5/16″, 11/32″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″ & 6mm, 8mm, 10mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm. [Practical Design] – 12-Point box end snugly fits hex-shaped fastener heads. The 72-tooth ratchet gears need only a 5-degree working swing arc, suitable for any narrow space. [Portable Roll-up Bag] – The Roll-up tool bag keeps all the wrenches well organized and makes it easy to carry and storage. [Wide Application] – This wrench set can be used for a wide range of jobs like, auto repair and maintenance, mechanic repair, pipeline repair, electrician repair etc.