The Faithfull Fixtec Locking Nut allows angle grinder discs to be changed in seconds without the need for additional tools. Only 8mm thick, enabling more disc surface to be utilised when grinding material. Compatible with all manufacturers angle grinders up to 150mm diameter that have a standard M14 spindle thread. Not suitable for use on angle grinders with a brake or quick stop system. Please note this product is not for use on any grinder bigger than 150mm.