The Star M adjustable hole cutters are yet another innovative tool and new to Australia. The sharp cutting blades move steplessly on the arbor by means of a thumbscrew and are then locked into place by tightening the two knobs on either side of the tool. The finely balanced cutter will cut holes 25mm to 75mm in diameter in a variety of materials including fibrous cement boards. Indispensible for all trades: cabinetmakers, plumbers, electricians, model and clock makers etc.