One Way Terminal Junction Boxes have various finishing such as hot dipp, electro galvanised and black enamel. The Boxes have 60.3 mm internal diameter X 25.4 mm deep tapped in mm sizes and in imperial sizes of 50.3 mm with tapped hole in base for earthling screw. The Boxes are offered in 20 mm, 25 mm, 32 mm, 38 mm, and 50 mm size. The One Way Terminal Junction Boxes are made using pig iron/ iron malleable.