This SHELIX head can be used on Shapers and Moulders with a spindle diameter of 40mm. You can use it to turn your shaper into a "SHELIX equipped Jointer" or for cutting templates by using a rub collar bearing. These bearings can be ordered along with this SHELIX head. Note: The end knives on this SHELIX head exceed the body of the head in length by approx. 0.1". When using a rub-collar bearing, a shim in between cutter head and bearing must be used to ensure proper operation of the bearing.