I bought these for transferring patterns onto wood in various carving and scroll saw applications. They are sharp and having three sizes is nice. One wheel was poorly aligned when I opened the package and required some careful work to make it right. The pivot screws that go through the wheel to hold it on the handle, for some reason, have the screw slots ground off after assembly. The one with the problem was way loose and let the wheel wobble terribly from side to side. I took some small pliers and was able to grasp the head of the screw and tighten it just enough to close the sides of the handle together while pinching them to take pressure off the screw. It worked, but their quality control folks should have really caught this problem. I do recommend these tools, just look them over carefully when you get them to make sure they are good ones. The screws are tiny and could break or strip out easily, so if you are in any way unsure of yourself, return them and get a replacement set.