These are Drop in M4 T nuts which are compatible with 30 x 30mm T slot aluminum extrusion.
Options
10 pcs - Rs 15 per pc
30 pcs - Rs 13 per pc
50 pcs - Rs 11 per pc
100 pcs - Rs 09 per pc
Compatible Profile
3030 T slot
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).