Bolton Aerospace Ltd (Ipswich), formerly Delta (Manganese Bronze) Ltd / Cerro (Manganese Bronze) Ltd was established in Londo ... n in 1876 as a producer of cast and wrought copper alloys. For over 100 years Bolton Aerospace Ltd has offered a full range of both cast and wrought products in the form of continuous castings, extruded, forged and hot rolled products, in a wide range of shapes and sizes-rounds, hexagons, squares, rectangles, discs, rings and hollows. Visit www.Boltonmetals.com for more information read more