I bought a couple of these cutters in 2 and 3mm from J & L to try with aluminium. Haven't spun one up yet, but I reckoned that half fishtail point should be good for a fine horizontal finish. Wonder how it copes with a vertical plunge, I always prefer to add some horizontal movement when I sink a fishtail, but that might just be my poor old brain seeing problems that do not exist :whistling: