I am new to using a router. I broke a few cutters from removing too much wood in one pass. These replacement parts were the best value I could find. So far, so good. No questions. I'd really like a 1/8 wide nozzle in the kit - it's hard to find that size. I write honest reviews to help others make an informed purchase. I do this because I read reviews myself and understand how helpful they can be. I hope my review was helpful to you.