547-61463685545 Features: -Crystolon Combination - for general sharpening when the speed of sharpening is more important than the fineness of the cutting edges.-Crystolon-India Combination - producees strong, long-lasting, keen edges on tools.-India Combination - produce strong, keen, long-lasting edges on quality tools.-India-Soft Arkansas Combination - preferred by woodworkers for sharpening straight blades and gouges.-Applicable Materials: Hard Steel.