Powers Fastening Innovations 50386 Drive Pin 1-1/8-Inch Length 0.300 Head 0.145 Shank Diameter with 3/4-Inch Emt Conduit Clip Assembly, 100 Per Box Designed for permanently fastening a fixture to concrete, some types of masonry and steel Knurled shank designs are available to increase performance in steel base materials 100 per box