The reamer arrived covered in rust. Dimensionally, it's pretty accurate; I have repeatedly measured 0.315 inches (8.001mm) with a micrometer. As I plan to use it in plastic and possibly aluminum I hope it still works. For the price I didn't expect the highest quality. but I definitely expected more than what I got. I was going to give it, wanted to give it one star at first but reluctantly gave it two just because it's the right size and it's cheap.