Blade grinders don’t grind consistently for making quality coffee drinks. They have a blade similar to that of a propeller that chops the coffee beans. The fineness of the grind is determined by how long you let the grinder operate via a built in timer. The longer it grinds the finer the coffee becomes.
The burrs are the part of the grinder that crushes the coffee beans into a uniform size which is essential for creating an awesome espresso/coffee. This type of grinder is known for their flexibility and quality.