Feature: 1. Reverse spiral flutes are designed to bite down for maximum gripping power, more reliable and practical. 2. With a 3/8in square drive for use with hand ratchets, impact wrenches & air ratchets; hexagonal flats for use with flat wrench, pliers,adjustable wrench, sockets. 3. Made of chrome vanadium material, has excellent properties when heat‑treated, like good strength, toughness, and resistance to wear and fatigue. 4. Light weight vanadium metal retains its resistance to things such as salt water, hydrochloric acid and sulfuric acid that cause erosion and oxidation. 5. This socket tool is manufactured to meet standard specification, strictly follow factory quality control. Specification: Condition: 100% Brand New Item Type: Socket Tool Kit Material: Chrome Vanadium Color: As Pictures Shown Size: Approx.1/4in(6.4mm), 5/16in(8mm), 3/8in(9.5mm), 10mm(0.4in), 7/16in(11mm), 12mm(0.47in), 1/2in(12.7mm), 13mm(0.51in), 9/16in(14mm), 5/8in(16mm), 17mm(0.7in), 11/16in(17.5mm), 3/4in(19mm) Recommended Tools: Ratchet Wrench Quick Release Ratchet Wrench Hand ratchets Impact wrenches Air ratchets Flat wrench Pliers Adjustable wrench Sockets . Package List: 13Pcs/Set x Socket Tool