Golf Shop: GOLFSMITH Black .370 Ferrule Pack of a Dozen

365ui Iron Ferrule : Ferrules are required on metal clubheads with flat-topped (non-radiused) hosels to provide the taper and enhance the appearance of the club. Many Golfsmith ferrules have outside diameters that closely match those of our clubhead hosels and thus require little or no turning. Features: I.D.: .370 O.D.: 13.5 mm Length: 6.4 mm Black