Large 1-inch top hub stainless steel niches are formed with brass fittings. Niches which have internal and external grounding lugs use with either metal or PVC conduit for installations. It includes vinyl niches with chrome and brass sealing rings. Made of stainless steel housing. Measures 11-1/2-inch length by 8-1/2-inch height by 11-1/2-inch width. It is certified by UL and CSA.