Ingersoll Rand 5102MAX Air Die GrinderIngersoll Rand 5102MAX Air Die Grinder, 20,000 RPM, 0.4 HPWeiler 56490 Mounting Mandrel For Cut-Off Wheels W/3/8" Arbor Hole, 1/4" StemThe Weiler 56490 mandrel securely mounts a Type 1 cutoff wheel with a 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. Specifications Arbor size 3/8" Accepted wheel thickness 0.035" to 1/4" Shank diameter 1/4" 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.