Strong, glass-filled nylon construction. Uses re-circulating water to eliminate over-heating of the blade edge and loss of steel temper (blueing). Water-cooling is acknowledged by professionals to hone the finest edges. High quality aluminium oxide grinding wheel sharpens 50+ chisels based on 1"/25mm width. Grinding wheel is replaceable for longer tool life. Features a tool rest which provides a firm base for re-pointing and re-edging a variety of small tools such as cold chisels, bradawls, screwdrivers, centre-punches, scribers, wood carving / turning tools, gouges etc. Marked angles on the rest indicates the tip angle. Chisel clamp accurately holds the blade at the selected angle for a precision ground edge. Traditional leather strop supplied to remove any burr for a razor sharp edge. Any domestic electric drill suitable as power source.