The 3 hole - slotted inside corner bracket is an external fastening method that creates a 90 degree connection. There are two stacked holes on one side and one slotted hole on the opposite side of the bracket. The slotted hole allows for a larger degree of adjustability between connecting profiles. This fastener requires no machining services and can provide infinite positioning along the profile T-slot. The 3 hole - slotted inside corner bracket engages the 2-degree drop-lock feature when the assembly bolts are tightened to the required torque. This bracket can be repositioned and reused. The suggested mounting hardware can be found on the "Suggested Hardware" tab.