5in. TwistFit Mounting Bracket is used for installing into compatible Hampton Bay and ETi LED Coastal Bulkhead Light fixtures. Hampton Bay LED Oval Bulkhead Light - Model# 504071010, Hampton Bay LED Round Bulkhead Light - Model# 504081010, ETi LED Oval Bulkhead Light - Model# 504071020 and ETi LED Round Bulkhead Light - Model# 504081020. TwistFit Mounting is a breeze using the our mounting bracket. First, pass the wires from the electrical outlet box through the middle hole of the mounting bracket. Align the mounting bracket using the mounting screws (provided) and tighten securely to the electrical box. Proceed making wiring connections. Alight the side slots on the fixture with the mounting bracket and fix the fixture securely by carefully rotating in clockwise the side slots inside the mounting bracket.