10Pcs 4040 Corner Bracket for 4040 Series Aluminum Extrusion Profile. - 6Pcs 4080 Corner Bracket for 4040 Series Aluminum Extrusion Profile. 10Pcs 4040. The L shape corner bracket used for setting up a right angle connection of the two aluminum profiles, insert the two ends of the L bracket into the groove of the profile, and tighten the set screw to fix the two profiles.
eBay