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Terrans 150Pcs 2020 Series M3 M4 M5 European Aluminum Extrusions Slim T-Nut Hammer Head Fastener Nut Assortment Kit These t slot nuts let you attach plates, brackets, and other parts to standard 20mm aluminum extrusions (with a slot opening of 6mm) with standard M5-0.8 screws or bolts (not included). They can be inserted post-assembly by dropping them into the slot. inserting a nut into the slot and twisting with a screw locks the nut in place. Use to build CNC routers, 3D printers, CNC laser cutters, CNC plasma cutters, robotics projects, 3D carvers, machine guards, workstations, etc. Note: These hammer nuts require a slot opening of 6mm to work properly. 80/20 20 series extrusions, for example, have a smaller opening, making it impossible to drop in these nuts or twist them into place even if the nuts are slid or rolled in. Package Included: -M3 T Slot Nut(10 x 6 x 4mm / 0.4" x 0.24" x 0.16") -------- 50pcs -M4 T Slot Nut(10 x 6 x 4mm / 0.4" x 0.24" x 0.16") -------- 50pcs -M5 T Slot Nut(10 x 6 x 4.5mm/0.4" x 0.24" x 0.18") -------- 50pcs -1*plastic box