For metallic and non-metallic cording and cable. Easy to install; drive both zinc plated nails together without splitting wood. Recessed nail heads for minimum exposure. Smooth saddle (3/8 in width) prevents damage to insulation. High grade, injection molded polypropylene resists rot, rust, deterioration and effects of extreme temperature; non-conductive for safe and secure cable fastening. White for 14 gauge, yellow for 12 gauge and orange for 10 gauge.