The 4 hole - wide slotted inside corner bracket is an external fastening method that creates a 90 degree connection. There are two adjacent holes on each side of the bracket. Two of the adjacent holes are slotted, allowing for a larger degree of adjustability between connecting profiles. This bracket requires no machining services and can provide infinite positioning along the profile T-slot; it also engages the 2-degree drop-lock feature when the assembly bolts are tightened to the required torque. It is a fastening method that can be repositioned and reused. The suggested mounting hardware can be found on the "Suggested Hardware" tab.