CSI Spiral Drive Pins are designed for permanently fastening a fixture to concrete, concrete over steel deck, concrete masonry walls and A36 or A572 / A992 structural steel. The fasteners are manufactured with an 8mm head and 0.157" diameter shank in various lengths; a 0.145" diameter tapered shank with 1/2-inch length is also available. A spiral knurled shank design provides consistent optimized performance in steel base materials. For single fasteners, a plastic washer is mounted on the pin shank to retain the drive pin in the barrel of the tool and provide centered guidance during the driving operation. The fasteners are also available in collated strips.