The Weiler 56491 mandrel securely mounts a Type 1 cutoff wheel with a 1/4" or 3/8" arbor hole onto a grinder that accepts 1/4" stems. The mandrel is designed to fit 0.035"- to 1/4"-thick cutoff wheels and is made of carbon steel for strength and extended tool life. The mandrel consists of a shank and a screw. The shank inserts into a grinder chuck. The arbor end of the shank accepts a cutoff wheel, and the screw portion of the mandrel threads into the shank, securing the wheel to the mandrel.

Weiler manufactures precision brushes, abrasives and maintenance products. The company, founded in 1898 in Germany and headquartered in Cresco, PA, meets International Organization for Standardization (ISO) standard 9001.