Rotating Carbide Scarifier Bits for motor graders and groomers are self-sharpening for more uniform wear and longer life. Similar carbide scarifier bits would be used in asphalt milling applications as well. The key to long wear life is maintaining carbide teeth rotation. There are numerous rotating carbide tooth options available for all applications. We recommend going with a carbide rotating bit option that has a washer to separate the bit from the board and help keep grime out. As soon as the bits stop rotating the operator is prematurely wearing the carbide bits. Proper maintenance and check up should be done to make sure the carbide bits are properly rotating.