The Forney 71650 4-1/2-Inch Blue Zirconium 80 Grit Type 1 Steel Sanding And Grinding Wheels are high quality disc that cuts faster and lasts longer than most other discs on the market. High performance for grinding, deburring, polishing metals, welds and stainless steel. Fast stock removal. Extremely long life. Cool cutting action. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5, 000 products for the hardware, automotive, farm & ranch and do-it-yourself markets. If you've got metal working questions, we've got answers. We're committed to your success regardless of location size or needs. 4 1/2 inch (114.3 mm) with 7/8 inch (22.23 mm) arbor size. Made from 100% zirconia grain, 80-grit, 3-pack. Proof of purchase required. neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.