Hammond 1554 Watertight Flat Lid Enclosures are ideally suited for mounting printed circuit boards or DIN rail mounted components. The 1554 Series features a gasketed lid with two piece "tongue & groove" construction which provides protection against access of oil, dust and water. The lid is secured with self captivating - M4 stainless steel machine screws (included), threaded into integral stainless steel bushings (for repetitive assembly & disassembly). The gasket is factory poured using high temperature U.L. listed silicone rubber gasket material. The 1554 Series is designed to meet IP 66 & NEMA 4, 4X, 12 & 13 ratings.