UNIVERSAL TOOL: This unique and robust design allows the spanner to self-adjust on any shaped nut whether its a hex nut, wing nut, lag bolts, tensions screws. You can tighten or loosen any fastener that is within the size of this particular wrench. It doesnt matter what shape the nut is. PROFESSIONAL TOOLS WIDELY USED - Thick, Heavy Duty, Professional Tool That is Designed To Tackle All Your Projects Around The House, In The Shop, Or On The Job Anywhere, Anytime Outdoor, Cycling, Home, Kitchen, Indoor, Outdoor Vehicle, Work for Cars Spark PlugsSOCKET WRENCH COMPATIBILITY - Spline Bolts, 6 Point, 12point, Torx, Square Damaged Blots And Any Size Standard Or Metric, 8mm (5/16), 10mm (3/8), 11mm (7/16), 13mm (1/2), It Shows On The Wrench With Numeric Etchings To Show The Corresponding Sizes. PORTABLE: This universal wrench with compact design and lightweight allows you to carry it with you instead of carrying a set of different size wrenches for the same job this one spanner can do in a finer way. MULTILATERAL: Thick, heavy duty, professional tool thats designed to tackle all your projects around the house, in the shop, or on the job Specification:8-19mm