AUTO CONER DRUMS Most Suitable for woolen and worsted yarns, Evenly hardened so that recesses and grooves are equally protected, Wear resistance surface increase drum life by two times compared to hard Anodized Drum, Alloy Metal Plasma Coated Drums for Schlaforsht Autoconer 138, 238, 388, Savio Autoconer espero, Orion, Murata Mac-Coner 7II, 7V