Round countersunk head machine screws and wood screws for a decorative effect. Brass construction provides excellent conductivity and corrosion resistance. [Features] ·When used with round countersunk small or wood screws, it creates a decorative effect. Eliminates the need for counterboiling of the opponent. Brass for excellent conductivity/corrosion resistance. Nickel plated. [How to use] A washer for use with round countersunk head machine screws/wood screws.