Permanent 5/8-11 hub that can be used to run 7/8" arbor holed grinding wheels on a grinder that is designed to only use a 5/8-11 hubbed grinding wheels.  Since 7/8" grinding wheels are so much cheaper than 5/8-11 to produce & buy, this could save you lots of money during the life of a grinder.

Includes:

• Safety Hub for 5/8-11 Grinder
• Nut to Screw Down
• (2) Spacers
• Allen Wrench to Tighten