1 bag of self locking nuts contains 100 M3 DIN 985 nuts. Self locking nuts have an inherent locking action, so that it cannot readily be loosened by vibration. They fasten very tight, but can be reused. These are  not meant to slide into any of the T-slots. You can only use these to fasten brackets from the outside. Our 6mm bolts can be used with these, but the hexagon head bolts 8mm length (art no. 106085) works best with these self locking nuts.