Kett 92-22 Side Knife is a part for the 93-20 shear head. The 93-20 shear head is a 1/2-inch capacity steel shear head for cutting fiber-cement. This durable, lightweight shear is designed to make quick work of cement board up to 1/2-inch thick. No airborne dust for minimal clean up. Variable cutting speeds up to 2500 RPM will match your pace. Reliable, long-lasting A-2 tool steel blades far outlast any other cutting method.