The 4 hole - inside corner bracket with single support is an external, die-cast fastening method that creates a 90 degree connection. Each side of the bracket has two holes stacked one on top of the other while the single support provides additional strength. The slotted mounting holes allow for greater adjustability between the connecting profiles. Brackets with a slot tab on the support help to line up the profile with the bracket and prevent rotation. It requires no machining services and can provide infinite positioning along the profile T-slot. The suggested mounting hardware can be found on the "Suggested Hardware" tab.