Specifically designed to provide a rapid and secure fixing when erecting cable trays. The fixed washer to flange nut prevents it from falling into the socket driver. Flange nut is DIN 6923" Thread Dia. mm: M6 Length mm: 12 Head Type: Dome Head Dia. mm: N/A Recess Type: Combi Point Type: B Point Finish: Zinc Material: Carbon Steel Timco Cable Tray Bolts with Flange Nuts - Zinc (Size M6 x 12 - 200 Pieces) in Silver