Spire diamond files are made of steel, which is thinly electro-plated with diamond. Available in 400 and 600 grit in either round or square. Because of their flexibility, these files are very durable making them extremely effective when polishing molds with very narrow and deep ridges.
Use with our handheld, double-ended, reversible collet pin vise (820-4350, sold separately). Made in Japan.