Delux Cage Nut Tool This tool is invaluable for civil engineers who want to insert or remove cage nuts. No more cut fingers with sharp tools and screwdrivers. Fits the 8.3 & 9.5 hole variants of the M4, M5 & M6 cage nuts. The cage nut is placed in the jaws of the tool, which then press the sides of the cage nut so that the legs can be easily inserted into the hole. - Quick and easy installation - reliable installation - no damage to the plate - reduces the risk of injury.