Fasteners for Guardrails H.D.G. In this category of products you can find: Hexagon Bolt, Fully Threaded (Din 933, 934 / 5.8, Din 933, 934 / 8.8) Cap Head Nib Bolt (Din 607, 934 / 5.8, Din 607, 934 / 8.8) Square Flat Washer Flat Washer (Din 125) Click on the image to see the list