3-1/4" (82mm) size Spiral Cutterhead for MAKITA Planer such as N1900B, N1923B,KP0800X, etc ... to replace the conventional straight planer knife:Carbide Insert for a good cutting quality and long working life. ... time and money.The cutting chips are very small for easily chip ejection.3-1/4" (82mm) size ... Spiral Cutterhead for MAKITA Planer such as N1900B, N1923B,KP0800X, etc.4 ...