... 4", 4.5", and 6", 8", 10",CASE MATERIAL:Steel case, steel black case, steel chrome plated case ... with front flange, backflange and U-clamp.BEZEL MATERIAL:Steel black bezel, steel bezel, chrome plated bezel ... lens are availableACCURACY:ASME B40.1 Grade B (3-2-3%)ASME B40.1 Grade A (2-1-2%)OPTIONS ... with front flange, backflange and U-clamp.BEZEL MATERIAL:Steel black bezel, steel bezel, chrome plated bezel ...