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Amazon.com: boeray Inner L Bracket for Metric European Standard 3030 Series Aluminum Extrusion Profile Slot 8mm- Interior Joint, 16 L Joint + 32 Set Screws + 2 Wrench Tools : Industrial & Scientific
Amazon.com: PZRT 12-Pack Aluminum Profile Corner Bracket,20mm x 20mm x 17mm L Shape Right Angle Joint Bracket Fastener,for 2020 Series Standard 6mm Slot Aluminum Extrusion Profile : Industrial & Scientific
Amazon.com: PZRT 12-Pack Aluminum Profile Corner Bracket,20mm x 20mm x 17mm L Shape Right Angle Joint Bracket Fastener,for 2020 Series Standard 6mm Slot Aluminum Extrusion Profile : Industrial & Scientific