The Merit M-7 mandrel securely mounts cartridge and spiral abrasive rolls, also called tapered cartridge rolls, onto a grinder that accepts a 1/4"-diameter shank. The mandrel fits cartridges and spiral rolls with a 1/8"-diameter center hole and is recommended for 3/4"-long rolls for maximum performance. The one-piece mandrel body is made of steel for strength and extended tool life. The mandrel has an unthreaded end that accepts a roll and holds it in place with a cone-shaped segment, and it has a 1/4"-diameter shank that inserts into a grinder's chuck.

Merit Abrasives manufactures abrasives for the deburring and finishing industries. Merit, founded in 1945 and headquartered in Cleveland, OH, meets International Organization for Standardization (ISO) standards 9000 and 14001.