The Lubic 3519 Kit provides two different methods for joining the aluminum framing pieces together. Consumers can use a series of anodized "L" brackets that have been tapped with two screws threads at either ends or use the assorted bag of Metal Sliders that have been tapped with three thread holes. The Metal Sliders fit within the channels of the aluminum framing pieces and are secured using the included 6-32 or 8-32 mounting screws.



Link: MTB