Aluminum Oxide Silversmiths' Flat Tapered Stone 4" x 5/16" x 3/16" - 1/16" Made in the USA These Hard Black Arkansas stones

These Hard Black Arkansas stones are very fine stones

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MAG-8000 and MAG-9000 Machines for fast sharpening of conventional lawn mower blades

Aluminum Oxide Silversmiths' Flat Tapered Stone 4" x 5/16" x 3/16" - 1/16" Made in the USA These Hard Black Arkansas stonesAluminum Oxide Stones Aluminum oxide stones excel at refining surfaces, offering a finer finish than silicon carbide stones. Their durability and ability to hold their shape well make them ideal for touching up special instruments, cleaning tools and dies, and for honing to close tolerances. These stones are a good choice when a high quality finish and accuracy are critical. Oil Filled These Aluminum Oxide Stones are filled with oil in manufacturing,