Used to insert into the arbor of a saw blade to match the smaller saw arbor.
Match the outside diameter of the bush to match the bore of the blade, and the bore of the bush to match the arbor of the saw. Match the plate thickness of the blade to the thickness of the bush, without going thicker or needing to use two bushes. Match thinner bushes to thin kerf blades with a thinner plate thickness.
NOTE: Not recommended for use with dado blades.