Ultra thin grinding discs, from .006" to .015" thick, composed of rubber-bonded silicon carbide with pin hole for mandrel mounting. Generally used on porcelain, ceramics, cubic zirconia, and for precision cutting of gold, silver, pewter, and most other non-ferrous metals. All have 1/16" arbor holes. Will cut on the edge and both sides. Maximum speed: 21,000 RPM. Made in USA.