This is going to be a short and sweet review simply because I can't use this device. My mistake was ordering a VERY large attachment for my small router. With that in mind, I can speak with confidence about the structures and building materials used in this piece. Seems top notch and the spindle is sturdy and I'm sure it will work well on heavy machines for rounding large pieces of wood, I just can't test it. So check the size and don't make the mistake I made reading the description. I thought it was a Β½ inch bit when the Β½ inch part referred to the shank size. I hope this helps you with your shopping. If so, let me and others know below and leave a comment with your questions. Regards Cass