An open-ended wrench with a movable jaw is known as an adjustable spanner. Although it serves the same purpose as a standard spanner, which is to grip fasteners like nuts and bolts, only adjustable spanners can do this because of their movable jaw. Buy adjustable wrench 10 inch -HADW131108 online on our official website at best prices. ✓ Fast and Free Shipping ✓ Free Returns ✓Cash on Delivery available.