Line Weight:80-Grit The Forney 60191 1-inch by 1-inch mounted flap wheelfeatures durable, high-grade aluminum Oxide coating for aggressive cleaningand refinishing on most wood or metal surfaces. Ideal for mounting on powerdrills or other chuck driven machines. Forney Industries is one of America’slongest operating family-owned metal working product companies. Founded in1932, Forney offers more than 5, 000 products for the hardware, automotive,farm and ranch and Do-It-Yourself markets. 1-Inch (25.4 mm) by 1-inch (25.4mm) with 1/4-inch (6.35 mm) shank mounted flap wheel. 80 Grit. 30, 000 maxRPM. Claims for warranty must be made within 90 days of the date of purchase.Proof of purchase required. This warranty does not cover any product that hasbeen subject to misuse, neglect, negligence or accident, or that has been usedin any way contrary to the purpose intended.