Spanners And Adjustable Wrenches Available here. There's a good reason that the spanner is a universal symbol of mechanical work. It's very simply one of the most useful tools you can add to your tool chest. Spanners and adjustable wrenches have everything you need in a hand tool: durability, strength and reliability. Find the exact fit if you know the size and type of tool you need. If you're starting out, or recently purchased a new car requiring different spanner sizes, buy a set and save some money. Many of these spanners and adjustable wrenches have a square spanner end and a universal ratchet end, making them versatile enough to handle many jobs. A good set of spanners can last a lifetime, so get a set and get ready to get to work!