Cross section allows use on convex and concave surfaces. Tapered very slightly towards point both in width and thickness. Smooth Cut: Approx 62 teeth per 25mm (Fine).Second Cut: Approx 36 teeth per 25mm (Medium).Bastard Cut: Approx 26 teeth per 25mm (Coarse).Size. 300mm (12in)Cut half round bastard Flat Side: Double CutHalf Round: Double Cut.Tanged