Aluminum T-Slot Extrusion and You by Ruddick Lawrence

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T-slot, take your other bar and slide it over the connector We're going to take our wrench

45 series T-slot inside corner brackets & gussets are designed for use in 45mm T-slot framing systems, offering robust right-angle connections  5pc T Slot L-Shape 2020 Aluminum Profile Interior Inner Corner Connector Joint Bracket With M4 Screw For Extrusion Slot-6 · DIY Supplies

slot pesa withdraw 8020 Shop Aluminum 2 Hole Inside Corner Bracket for T Slot Extrusion, 90° Angle - 8020, 4302, 15 Series 2 Hole Slotted Inside Corner Bracket