Double Stud Fittings for L-Track are designed for added strength over standard single stud fittings and connect to two airline track slots. This particular airline track fitting has a slot in it for polyester webbing or cotton webbing to be inserted through for assembly purposes. You can also attach straps with hooks and other end fittings depending on your application.
To install a double stud fitting, lift the end clip and insert the two bottom discs into the track slots. Slide until it's halfway between two slots and release the clip to lock the fitting in place.