XION Super Grab Sockets. Will remove nuts and bolts that are up to 85% rounded off. 1/4" Drive. Revolutionary inner profile will continue to grip where other sockets would fail or slip. This item will replace single sided sockets / bi hex sockets / spline sockets and many more extractor sets. Unique XION design gives total contact even on severely worn nuts. Manufactured from chrome vanadium steel for strength and durability. Satin finish and knurled rings for maximum grip in oily conditions. Includes Metric Sizes; 4mm / 4.5mm / 5mm / 5.5mm / 6mm / 7mm / 8mm / 9mm / 10mm 11mm / 12mm / 13mm and 14mm Supplied in plastic tray, perfect for keeping sockets organised in tool boxes/chests.