Aluminum Oxide Silversmiths' Flat Double Tapered Stone 4" x 1/2" - 1/4" x 5/16" - 1/8" Made in the USA The Cotpyr is 200mm x

The Cotpyr is 200mm x 60mm

Additional DoubleX+ Test Media is available for refilling Aluminum Test Fixtures

The exterior of the unit is made of durable black plastic

Double-Sided Water Stones

Use it on your chisels

Aluminum Oxide Silversmiths' Flat Double Tapered Stone 4" x 1/2" - 1/4" x 5/16" - 1/8" Made in the USA The Cotpyr is 200mm xAluminum 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,