For lathes with 1-1/2” x 8” and 2-1/4” x 8” threaded spindles, these Blank Plates allow you to make modifications to fit your lathe chuck. Simply mount to your lathe, true up the face and turn down the ledge to fit your chuck. All South Bend back plates are made of fine-grain cast iron. Whether you need a blank or semi-finished back plate, you can depend on the quality and precision you’ve come to expect from South Bend.