These CMT insert style router bits have been designed for signmaking and lettering. They use solid carbide insert knives so that when the insert shows signs of wear, you can simply rotate it to exploit the other cutting edges. Locking screw secures insert tightly for safety and high cutting accuracy. The bit is 7/8″ diameter with a 7/16″ cutting depth and a 90 degree angle cut with a 1/4″ shank.