UNIVERSAL TOOL: This unique and robust design allows the wrench to automatically adapt to any nut shape, whether it's a hex nut, eye bolt, or tension screw. You can tighten or loosen any fastener within the size range of this wrench, regardless of the nut's shape. PROFESSIONAL & HEAVILY USED TOOL - A thick and robust professional tool designed to handle all your projects at home, in the shop, or at work! Anywhere, anytime! Compatible with outdoor use, bikes, homes, kitchens, indoors, vehicles, and car spark plugs. Socket wrench compatibility - Spline bolts, 6-point, 12-point, Torx, damaged square spots, and all standard or metric sizes, 8mm (5/16''), 10mm (3/8''), 11mm (7/16''), 13mm (1/2''). The corresponding sizes are clearly engraved on the wrench. PORTABLE: This universal wrench features a compact and lightweight design, allowing you to take it with you instead of carrying a set of wrenches of different sizes for the same job this wrench can do more efficiently. MULTILATERAL: A thick and robust professional tool designed to handle all your projects at home, in the workshop, or at work! Specification: 8-19 mm