I bought a Ryobi Gas powered brush cutter and it came with a 3 prong dull cutter blade? I guess they come with the dull 3 sided metal thing for safety? Anyway I ordered me a 80 tooth Carbide cutting blade for it. I did remove the 3 prong dull metal thing and sharpen it enough to try the Ryobi gas powered brush cutter out. I cut about 100 feet trail wide. The Ryobi is going to work just fine once I get a real saw blade on it! I bet there are a lot of these 3 blade dull things laying in peoples shops...LOL