The ST 14 is a 6" diameter 4 jaw chuck which has reversible jaws. It comes with a key and mounting bolts. The chuck is a direct bolt up to the mounting plate on the MILL TURN and TURNADO spindles from 2015 onwards.
Earlier machines from 1990 to 2014 came with an 8" faceplate which was used as an adaptor for the 4 jaw chuck. For these machines you will need to machine the faceplate shoulder to match the recess in the back of the chuck and drill 3 mounting holes.