High torque, concealed clock movement for dials up to 1 metre (3 1/2 feet). Note the limitation on dial size is simply an aesthetic judgement of how any the three alternative hand sets will appear. The use of handsets other than those three...
These screws need a jeweler's screwdriver or similar - round Phillips head. Metric dimensions are nominal and specified as Overall Length x Shank Diameter Under Head x Head Diameter. See below for size and gauge code.