Steel window kits are designed to be used indoors on NEMA 12 enclosures. Stainless steel window kits are suitable for NEMA 12 and 13 enclosures in an indoor application. These kits are easily installed by making a cutout in the enclosure and attaching the window and frame in place. All necessary hardware is included. Kits are fully gasketed to maintain an oil tight seal Frames are made from heavy steel with a ANSI 61 gray polyester powder finish over phosphatized surfaces. Type 304 stainless steel with a grained finish.