Dear HomeDepotCustomer: We are sorry to hear that you had trouble with this blade. The 4.5" Segmented diamond blade comes with a 5/8" arbor ring pre-attached to a 7/8" blade arbor hole. When installing, always refer to the tool operator's manual first. Many tool companies, it is necessary to tap off the 5/8" adapter ring to ensure proper fitting. Please ensure the blade sits flush to the backing flange of your tool to ensure a proper fitting before securing the blade with your tool's screw nut/flange. We want to make sure our blades are working for all our customers. Please feel free to call us at our RIDGID customer support number at (877) 224-2969 so that we can help.