Square Drive Impact Extractor Sockets Extracts rounded, seized or painted right hand threaded fasteners, the reverse spiral flutes are designed to bite into seized nuts and bolts providing greater grip for extraction. The ejector pin is to drive out the fasteners from sockets, once removed. Contents: 10, 11, 12, 13, 14, 15, 16, 17 and 19mm extractor sockets plus ejector pin.