Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dissatisfied....

The design is simple and inexpensive. A roller with a metal brace attached. Unlike some other models I found, this one is made out of metal instead of plastic so it will probably last considerably longerI bought it thinking it would be just the ticket for sharpening a bunch of old chisels in my tool box. Unfortunately I couldn't get half the chisels to sit in the guide properly which made it unusable for those. Secondly, you have to position the chisel with a certain length extending from the front depending on if you want a 25 or 30 degree angle. If you don't measure "perfectly" you won't get the right angel and the chisel won't sharpen properly.I'm now looking for a design with a FIXED angle.