Premium Gold Test Stone-Made in the USA 3" x 1-5/8" x 1/4" Chains Rugged all-metal stand that turns

Rugged all-metal stand that turns a compatible flex shaft handpiece into a precise drill press

and lift the drill frequently to clear chips and debris

Near-instantaneous test results

these files are made of the finest heat-tempered chrome alloy steel

giving engravers and stonesetting professionals a dedicated

Premium Gold Test Stone-Made in the USA 3" x 1-5/8" x 1/4" Chains Rugged all-metal stand that turnsA professional grade gold testing stone made in the USA from natural Arkansas black novaculite, quarried and cut domestically. Used by jewelers and metalsmiths to test precious metals, this stonealso known as a streak stone or touchstoneprovides a reliable surface for acid based karat testing. Beware of cheap imitations made of glass, which stain and degrade quickly under repeated use. To test a metal item, rub or scratch it across the stone's