Sliding T Nuts are used for fastening parts to T-Slotted extrusion. The shape of the T-Nut allows the fastener to be inserted from the top or side to make quick and strong access to mounting holes without the need for drilling and tapping. The ball bearing allows you to insert and seat the T-Nut from the top of the extrusion without any extra hassle. 

For Extrusion Size: 40 Series T-Slot 

Thread Size: M8