OAJ1021 Features: * A universal all purpose designed clamp for medium-duty industrial service * Heat-treated, perlitic and/or ductile iron frames, ribbed to resist side strain with longer frame hubs for assured durability * Machine ground, extra wide anvils * Cold-drawn steel screws with special, smoothly square-cut Acme threads * Steel sliding-pin handles for secure hold * Exclusive Jorgensen swivels with steel internal tooth washers for positive stay-on power * 0 closing * 6"" opening * 2-3/4"" throat depth * 5/8"" screw diameter