Hammer Drive pins are designed for permanently fastening a fixture to concrete and some types of concrete block. This fastener is designed for use in a standard hand tool and should not be used in a powder actuated tool. The pins are formed with 1/4" diameter head on one end, a 0.140" diameter shank in various lengths, and a specially designed point to allow proper penetration into the base material. A 3/8" diameter steel washer is mounted over the point to retain the drive pin in the fastener guide of the tool and to provide guidance during the driving operation. This fastener is recommended for light duty static load applications where holding power is not a critical factor. It should not be used overhead.