These ZZ Turbo premium segments provide fast cutting and long life in avariety of brick, block and concrete materials. They stand .300" (7.5mm) tall. Laser-welded to hold up under extreme heat and cutting pressure. Barrel vents on dry bits increase air flow to dissipate heat and cool the core bit. Use on core drilling machines or right-angle grinders. Drills faster and provides smoother finish than conventional carbide-tipped percussion bits. Comes in pre-stressed concrete bit.