Use with ¼”, ½” and ⅝” GoBoard and spaced 100 fasteners and washers per box, 1.4 lbs box. 1- ¼" diameter hardened steel washer for maximum holding strength and durability. Tabs for pre-positioning washers prior to installing. Reversed tab prevents washers from stacking in package. GoBoard washer fasteners can be spaced at 12 inches. Corrosion resistant