three matching c. 1870's oversized american antique cast iron residential sliding door floor track rollers possibly designed and fabricated by the mallory & wheeler co., new haven, ct. the pocket door rollers or sheaves with single grooves are accentuated with heart-shaped piercings. the cast iron case or flanges retain the original "japanned" or baked black enameled finish. fully functional and operate smoothly. measure 6 1/2 x 1 x 3 1/2 inches. priced for the lot of three.