Martello Cleaver knife. The appeal of these hammer dot steel knives extends beyond the intricate patterning on the blades to their superior strength and razor-sharp edges. Beautifully balanced with a heavy bolster and ergonomic handle. These remarkable blades are truly something special. Always use a high quality steel by BergHOFF for your top quality knives. These sharpening devices are exactly made to match the steel of the blades and provide an optimum result. Be sure to maintain a 20° angle from tip to handle over the complete length of the blade. The speed of the process has no impact on the result.