The ductile cast iron body and working surface are accurately machined and ground plane is made up of professional quality tools manufactured to fine tolerances and therefore suited to the needs of even the most demanding craftsman. 3-in-1 plane is an extremely versatile tool, having three working – as a shoulder plane with the front extension fitted, as a chisel plane with all nose pieces removed, and as a bull nose plane with the thinner nose section and the shims attached. the blade is adjusted by a screw.