Correctly designed ductile iron frames, for greatest strength. Carefully fitted steel screws with sliding 'vise-type' handles. Oscillating swivels, put on to stay. Sizes: No. 1401-1430 are furnished with all parts attractively bright plated. Sizes: No. 1440 and larger are furnished in smooth, natural finish. A complete range of sizes offering a rare combination of serviceable quality. Made in USA with global sourced parts.