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The 72788 should work fine on a 4.5" grinder. 

Our Industrial Pro® line of wire brushes and wheels are the highest quality and will last the longest. For this job we recommend any of our Industrial Pro® 4" or 4.5" wire wheels. For a more economical wheel, which should get the job done, we recommend our 72788 wire wheel. These products can be found on our web store at www.forneyind.com/store.

The 72747 has a face dimension of 7/8" and the wire is .008" in diameter. This unit accommodates 1/2" and 5/8" arbors. The Industrial Pro version of the wheel comes with a 5/8" or 1" face dimensions and the wire is .012" in diameter. The ITEM# will change based on the face dimension. The wire is half again as thick as the wire on the 72747 and will perform better and last longer. The Industrial Pro version has an arbor system that will accommodate 7 different arbor sizes between 1/2" and 2". The ITEM# for the 5/8" version of the Industrial Pro wheel is 72895 and the 1" version is 72896.

Our Senior Product Line Manager for wire wheels and brushes found this article to be extremely helpful.  Please call us if you have more questions.

The Fabricator- article on wire brushes.pdf