TSLOTS TS40-40M Black 40mm x 40mm 8mm Aluminum Extrusion
Machine Guard Black Anodized T Slot 4040 Aluminium Profile - China Profile, Aluminium | Made-in-China.com
4PCS T Slot 4040 Aluminum Extrusion Profile 19.7'',European Standard Anodized Linear Rail for 3D Printer Parts and CNC DIY 500mm Black(19.7inch): Amazon.com: Industrial & Scientific
Amazon.com: 80/20 Inc., 40-4040, 40 Series 40mm x 40mm Extrusion x 610mm : Industrial & Scientific
40-4040-Black-FB | 40mm X 40mm T-Slotted Profile - Four Open T-Slots
M6 Sliding T Slot Nuts for 4040 Series Aluminum Extrusion Profile 10 Pcs - Walmart.com
E40-4040-10S-C - 40mm x 40mm Slot 10 Matches the 45 Series Slot 10(Cut To Length)