These are Drop in M3 T nuts which are compatible with 2020,2040 T slot aluminum extrusion, V slot aluminum extrusion as well as the Makerslide rail.
Options
10 pcs - Rs 18 per pc
30 pcs - Rs 16 per pc
50 pcs - Rs 14 per pc
100 pcs - Rs 12 per pc
Compatible Profile
2020 and 2040 T-slot, V-Slot, Maker Slide
How to use best?
These are drop in T nuts. They can be used while doing assembly or can be dropped in to the slot any time after completion of assembly (best suited for this).