This package includes (10) inside corner brackets, (20) t-nuts and (20) bolts giving you a total of 10 complete fasteners. 

HEAVY DUTY FASTENERS

The 2 hole - inside corner bracket is an external fastening method that creates a 90 degree connection. It requires no machining services and can provide infinite positioning along the profile T-slot, allowing a large degree of adjustability. The 2 hole - inside corner bracket 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.