The base was too rounded for the edge to fit snugly on the board making sewing difficult I figured it out after some use but even after a few days I had some staples splitting the tongue a bit. Also, it came with a 3/4" and 5/8" base, but I needed a 1/2" base which turned out to be too long. Next time I'd go with 1 1/2". Overall it worked pretty well though! I don't know what "thickness" means in the star rating section.