If you only want to go to 6mm in ally - these work well
http://www.tradetools.com/products/T5861
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If you only want to go to 6mm in ally - these work well
http://www.tradetools.com/products/T5861
I had the hand tool before I bought the air one. M6 was hard, M8 just barely possible with much grunting & swearing. Air tool is effortless, although as cuppa said you need to drop the pressure with a reg as it will easily strip a insert or break a shaft on the smaller sizes