Contains 300 Plaster Washer Ceiling Buttons with a Heavy-Duty Galvanized Zinc plating for better corrosion protection.
Outside Diameter: 1".
Inside Diameter: No. 10. Ceiling buttons (a. k. a. Plaster washers) are large diameter washers designed to hold up sagging plaster ceilings. They are countersunk in the middle for a drywall screw and perforated to hold spackle to hide repairs.