This product is a disaster. As a result of using this product, I found that it didn't fit securely on my grinder and was actually a hazard. It is shocking that an "Industrial and Scientific" product could be so poorly designed. The only pro is that it was shipped quickly. The major con is that it provides no safety and could lead to serious injury. I highly recommend avoiding this product at all costs.
Pros
Provides a safe grinding experience by protecting the user's fingers from accidental cuts and injuries.
Cons
May require frequent cleaning and maintenance to ensure optimal performance and effectiveness.
Works well and maintains a 90 degree cut and is more than adequate for average home use but I wouldn't consider it for everyday use . industrial environment.
It's almost three times cheaper than Harbor Freight and only fits Harbor Freight angle grinders, which have an extremely small, non-fluted mandrel. It is NOT universal.