Bought this to see if the ash biscuit top would cover. It will not. Mounted on a Dewalt variable speed router at 18,000 rpm on the first pass, it began to burn through the wood at a depth of cut of 1/16 and about 1/3 the width of the bit. It tarnishes very quickly and blunt tools are dangerous. I returned it. Don't waste your time or money. I bought a Freud 1 3/4" nozzle for a few dollars and am very satisfied.