Gundlach 78-J 1/8″ x 7/8″ Aluminum Drives (1 lb. jar)

Designed specifically for securing all types of metal trim and tackless strips, this fastener performs equally well on cement, terrazzo, marble, slate, or any masonry floor. The four corners of the square drive engage the wall of the undersized round hole with great force, providing several times more holding power than necessary for a secure fit. The flat head style measures 1/8″ in diameter and 7/8″ in length, requiring a 1/8″ x 1″ hole.