metal cutting have discseasier cutting

metal cutting discs have 24 teeth and are effective for work — such as rough carpentry — where speed is more important than a clean cut.
Plywood blades have 100 or more fine teeth designed to create a finish with minimal splintering.
Thin-kerf blades have a narrow profile for faster, easier cutting and less material waste.
Hollow-metal cutting wheels have a body that's thinner than the teeth — a design intended to help keep the blade from becoming pinched in the work piece.