THIS SET CONSISTS OF THREE JACOBS DRILL CHUCKS: NO 34, NO 32, AND 2A. MODEL NO 34 FEATURES A 0-1/2 CAPACITY AND A 3/4 SHANK. MODEL NO 32 PROVIDES A 0-3/8 CAPACITY WITH A 5/8 SHANK. THE 2A MODEL HAS A CAPACITY OF 0-3/8 INCHES (0-10MM) AND UTILIZES A #2 TAPER. THESE CHUCKS ARE DESIGNED FOR PRECISION TOOLING AND DRILLING APPLICATIONS, OFFERING AN EXPANDED DRILLING RANGE.