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https://www.adafruit.com/product/1217
Coupling Plate - 2 Holes - 20x20 Aluminum Extrusion : Adafruit Industries, Unique & fun DIY...
Attach various pieces of 20mm slotted aluminum extrusion together with this 3-hole plate.Measures 40mm long, 18mm wide, 4mm thick. 5.3m drill holes 20mm apart...
coupling platealuminum extrusion
https://www.se.com/pt/pt/product/NSYMPS60/reinforced-plate-supports-for-modular-chassiscoupling-set-600-mm/
NSYMPS60 - Reinforced plate supports for modular chassis-coupling set - 600 mm | Schneider Electric...
Schneider Electric Portugal. NSYMPS60 - Reinforced plate supports for modular chassis-coupling set - 600 mm
https://www.se.com/id/id/product/NSYMPS50/reinforced-plate-supports-for-modular-chassiscoupling-set-500-mm/
NSYMPS50 - Reinforced plate supports for modular chassis-coupling set - 500 mm | Schneider Electric...
Schneider Electric Indonesia. NSYMPS50 - Reinforced plate supports for modular chassis-coupling set - 500 mm.