Decent product. They work well.However, I assumed it was a normal sized arbor, for most grinders. It was smaller. No size of arbor in description. List the size. Found a way to make it work and they work well, just wish they fit better without having to make an adapter.These are great for aggressive shaping on soft and medium wood, although you need to be more careful with hardwoods... these have big, sharp teeth and grab in a hurry. They fit my Makita grinder perfectly and chewed right through heavy bark on 6/4 hickory.This things will eat wood right up. Great for getting into places you normally couldn't. That being said, they will also do a number on you if you get too relaxed working with them. Pay attention and they'll do what you need them to without you getting hurt as well.This item has been used before. I can’t imagine I ordered new vs I had delivered used one. There were very clear used sign in the product.