Right Angle Grinder.
See also Additional Info file on above web sites.
ZA60-TB-Flex: Flexible wheel design for fast cutting and easy work penetration.
ZA60-TB-Rigid: Thicker (.045) rigid wheel for fast cutting and longer life.
ZA60-T: Higher percentage of patented specially treated zirconia grain and premium fiberglass; Provides up to 10% more cuts, better finish, reduces burning and produces fewer burrs; Flexible and long life (highest G-ratio).
A60-T: Maximum cutting speeds with minimal burrs; excellent finish with reduced vibration; #1 wheel for steel applications.