KD-810 Ring engraving machine. Scale of-10 I give it an-8. First put some rubber feet on the bottom of the machine or when you use it will move away from you on your bench top. Second; the screw pin that stabilizes the ring has a plastic cup on the end that does not hold well and can cause your letter spacing to be off; it does not hold well at all. The jaws are nylon and are slick. I had to machine a small piece of metal rod and re-make this part and put a rubber boot in the end of it now it holds secure. Third; the instructions in the user manual were written by someone who never used the machine; the instructions was extremely poorly written. An extra pair of holding jaws is included. There is no parts list and no eight hundred number or online support available. If you ever need a replacement part in the feature your screwed. Last the machine is working out for me and it is doing a good job.