Aluminium, Brass, Bronze, Cast Iron, Copper, Silver Steel, Stainless Steel, Engineering Plastics and Exotic Materials. EN24T High Tensile Steel, 2014 (HE15) High Tensile Aluminium (Dural),Colsibro and Colphos Many imperial sizes are now becoming very difficult to obtain and may become unavailable. If you do not find what you are looking for please contact us to discuss your requirements.