Hi @samboy,
A warm welcome to the Bunnings Workshop community and thank you for your question.
Unfortunately, I note that the instruction manual for all Ozito Mitre saws that are currently for sale states that they are only "meant for cutting timber and plastics. Do not use the saw to cut metal or masonry."
While it may be capable of cutting aluminium trims, you risk voiding the saw's warranty if you do so.
Unfortunately, you may need to look at purchasing a different mitre saw that explicitly states it can be used for cutting metal or alternatively use a hacksaw.
Let me know if you have any further questions.
Jacob
