Aluminum Oxide Silversmiths' Flat Double Tapered Stone 4" x 1/2" - 1/4" x 5/16" - 1/8" Made in the USA The exterior of the unit

The exterior of the unit is made of durable black plastic

especially if you prefer a slightly toothy edge that cut with a saw-like action

you will be getting the same thing

Weight - 29oz / 814g

Aluminum Oxide Silversmiths' Flat Double Tapered Stone 4" x 1/2" - 1/4" x 5/16" - 1/8" Made in the USA The exterior of the unitAluminum 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,