Excellent product, and the files are a bargain, cause my local sheet metal shop wanted $200 just in design fees to do what u are only charging $25 for Swinksy(Jady).   A bargain of a idea, and anyone can be away and have their own mirror blades produced straight away cause all the hard work is already done, and the local shop can go straight into cutting now at hugely discounted rates than the retail prices other people offer for the end mirror blade product.   Bargain and PM sent.