The standard off centre chuck mounts directly to your lathe spindle via an adaptor. The off-centre chuck allows you to put details in your work that are not concentric with your lathe spindle. The amount of offset ( 0 -30mm ~ 1.2 " ) is easily adjusted using a hex key and the amount of offset is visible in a viewing window on the chuck. Of course, you can set the chuck offset to 0 and machine on centre as normal. The standard off centre chuck forms the basis of the deluxe version and has all of the same functions however you also have the ability to index your job around in 1 - 12 equal divisions allowing you to produce complex patterns and even square or triangular shapes. Your design can incorporate any multiple of 12 examples 2, 3,4,6, 12 your imagination is the only limit to your design.