Check the listing for details. RH Preyda Hard Ark MultiForm Stone 4". Condition: New. Listed at 35.48 USD. NEW, RH Preyda Hard Ark MultiForm Stone, 4", 163570, Grit range: 800 – 1000 grit, Stone Dimensions: 4” x 2”, Will sharpen and further refine an already sharp edge to a keen edge, Comes with protective case and small bottle of light mineral oil, These Hard Arkansas stones have a grit range of 800-1000 grit and will sharpen and further refine an already sharp edge to a “keen” edge. This Hard Arkansas Multiform Slipstone measures 4" x 2", with a round edge and knife edge that taper from 1/2" to 1/8". It is used by carvers to shape, sharpen and hone V-tools, and gouges, but it can put a nice edge on serrated knives as well. The stone comes in a protective case with a small bottle of light mineral oil. Stone can be used with or without lubrication, but we suggest light oil, which will keep the.