National Hardware N280-875 Bolt and Nut, Steel, Zinc

V7653 series pack of 12 zinc plated ribbed neck bolts and nuts, 1/4 inch diameter x 20 threads per inch x 1/2 inch length, hold 2 or more parts together, tighten without being on both sides of the door, knurled shank prevents bolt from spinning during installation and tightening, can be used to join metal angles and track brackets, primarily used on fiberglass garage doors.