Ammco Brake Drum Micrometer

Description

If the drum
diameter after machining is larger than the
manufacturer's specified rebore limit it must be
replaced.
Drums that are too thin are apt to be weak and
springy, and will not dissipate heat well, resulting in
a loss of braking power. Defective drums should be
scrapped.
Smallest drum 6" largest drum 16"
SAE measurement