These 4-Jaw chucks are constructed of fine grain cast iron and sport a super finish. Made to exacting tolerances to hold your work safe and secure. These are plain-back chucks that are drilled for front mounting screws. Walking into the factory that makes these South Bend Lathe chucks, one would be amazed at the plethora of high tech German made CNC machines, Zeiss and Tesa Comparators, and other testing equipment made by some of the most respected names in the world. These South Bend lathe chucks are amongst the best available on the market. Absolute top quality chucks made for high precision work and made with tight tolerances to satisfy the most demanding machinists out there!