Progress Lighting's P821-AT is a 6" recessed housing with 1/2" and 3/4" knockouts that is used for new construction applications. It has a notched steel housing for chalk line alignment. It features a universal J-box with snap-out sides, a grounding pigtail, and a socket that mounts to the trim for optimum performance and consistent lamp position. Progress Lighting has been committed to providing a diverse selection of high-quality lighting fixtures for over 100 years. This 6" Recessed Housing fits into a 2 x 8 construction. It includes integral nail bar hangers with integral T-bar mounting clamps for wood joist construction. It has a Trim-Lok action that forces the trim to fit snugly against the ceiling. This product has overall dimensions of 8 3/8" x 13" x 7 1/2" with a 6 7/8" ceiling opening. Safety is ensured as this P821-AT Incandescent Housing garnered a certification from the UL-CUL, an independent product safety certification organization which is recognized nationally. It complies with the Washing State Energy Code (WSEC) requirements, and is listed for damp locations. This product is manufactured by Progress Lighting, the home of first-rate lighting fixtures.