Boeray 20pcs M5 Slide in T Nut Drop in Nut Roll-in T-nut for 3030 Sereis Slot 8mm Aluminum Extrusion Profile Material:carbon steel; Quantity:20pcs Thread Diameter :M5 Total Size : 16 x 16 x 6mm (L*W*T); Used for : Aluminum Extrusion with Profile 30x30mm