Slide-in T-nut is a fastening option that loads from the profile ends. It is a strong, durable connection. An essential for working with slotted aluminum extrusion, these t-nuts slide into the side-slot of aluminum extrusion profile. Works with 6mm, 10 series profile. Slide in T-slot nuts are used to attach plates, brackets, and other parts to aluminum extrusions using matching bolts (not included).They are inserted into the end of the extrusion and create a strong connection. (Pack of 25) Item Dimensions (LxWxH) 0.49 x 0.43 x 0.17 inches. Compatible with 80/20 10 Series 3204 tnut