Lids & GasketBlack enamel or galvanised pressed steel light pattern lids and a black solid neoprene gasket for use with circular boxes in damp conditionsNoteGasket need to be bought separately.StandardsBS4568Steel To BS4568BS4568 Part 2 product finish classification.,Class 2 - Black enamelled inside and outside.,Class 3 - Pre-galvanised sheet steel.,Class 4 - Hot dipped galvanised inside and outside.