A nut or bolt with a rusted or rounded head is a frustrating problem, and all too common on old vehicles and machinery. There are many tricks to removing the damaged fastener, but none as quick and simple as the ToolPRO bolt extractor set. This set covers 9 common socket sizes from 8 to 19mm and their chrome molybdenum construction makes them tough, and ensures they will be corrosion free for years to come. The ToolPRO Extractor 9 Piece Socket Set is suited for a 1/2" breaker bar, ratchet or impact wrench and includes 12, 13, 14, 17, 19, 21 and 24mm sizes. Using the ToolPRO bolt extractors are as simple as working with a regular socket. It is best to employ their use as soon as the nut or bolt becomes rounded, to ensure extraction goes smoothly. Choose the bolt extractor that matches the size of the nut or bolt head, and the teeth will bite into the metal as you undo the fastener. The process is the same for a rusty fastener, although use of a regular socket or spanner should be avoided - with the bolt extractor being used first up. A squirt of penetrating spray such as WD 40 will help the process along.