The Heli Pile is now manufactured in-house in two diameters, 60mm and 100mm. Both sizes are die cast from Grade LM25 (AlSi7Mg0.5) Aluminium Alloy. This alloy finds application in the chemical, marine, construction and many other industries, above all, in road transport vehicles where it is used for wheels, cylinder blocks and other engine and body castings. It is, in practice, the general purpose high strength casting alloy. It is also used in nuclear energy installations and for aircraft parts. It is recyclable and part of its chemical composition includes up to 10% of recycled aluminium. The "green" credentials are clear to see.