Diameter from 12mm to 14mm, and working length from 8 inch to 10nch. The ceramic sharpening steels are made of fine ceramics with very fine abrasive surface. Part of the stick is also grooved. This not only makes the stick more versatile - The fine grain size allows for extremely smooth surfaces and sharp edges. They are suitable for both rough and fine sharpening. They can do a quick and good job. A great kitchen tool. We offer wide and finest range of advance ceramic knives and kitchen accessories: knives, scissors, mills, tweezers, sharpeners, screwdrivers, metal-forming tools, Ceramic Battery-Fill Tool, rings, seals and valves, ball valves, bed knife, loom cutter, plungers...we produce also wide range of ceramic/diamond sharpeners. Zirconia was considered the wonder ceramic in many industries. Today we have elevated the standards of Zirconia to ultra-high hardness without the brittleness. CONTACTS: MR. TONY LIU, MANAGER TEL: 86 510 310 0215 FAX: 86 510 312 2853 M.P: 86 133 5791 8960 E-mail: sales at heqingceramics dot com Web Site: www dot heqingceramics dot com