Universally drive size for ratchets and extensions, ensuring tight connection and smooth accessory interchangeability without slippage. Includes multiple wrench sizes to cover daily fastening and loosening needs, eliminating the need for additional tools. Made from premium 45 grade steel with quenching for superior durability, resistance to wear, and deformation under heavy use. Finely polished jaw provide a secure grip on nut, slippage and ensuring stable torques transmission. Neatly organized in a case (26.5x21.5x5cm) for easy storage and transport, ideal for automotive repair, machinery maintenance, and home DIYer projects.