Clear finished, die-cast zinc corner connectors for T-slotted framing are available in inside-to-inside and inside-to-outside versions. These connectors provide a hidden 90-degree corner connection for 15. 30, 40 and 45 Series T-slotted profiles and are ideal for lightweight applications, according to the manufacturer. Set screws included. No machining necessary.                                (260) 248-8030.  80/20.net.