Amazon.com: Die Grinder Cut Off Wheel Mandrel - 1/4" Die Grinder Mandrel with 3/8" Arbor Hole for High-Speed Cutting Durable Arbor Adapter Cut Off Wheel Mandrel for Cleaning and Polishing - Drixet :
Generic Die Grinder Cut-Off Wheels and Mandrel Kit Including 12PACK 3"x.045"x3/8" Thin Cutting Wheels and One Mounting M
PFERD Mandrels for Die Grinders | 69026 | 1/4" Shank Diameter
Flexovit® 3/8"x1/4" SHANK Mandrel Adaptor for Die Grinder Wheels - Shannon Supply