Roofing Bolts with Square Nuts - Zinc M6 x 50 Manufactured with a large flat head, which distributes the load across the fixing to increase the clamping effectiveness. Making it ideal for clamping thin sheet metal, plastic and wood. Corrosion Rating: 1- Clean, dry and low humidity environments Finish- Zinc Head- 14mm Head Type- Dome Included Items- M6 Dome Nuts Material- Carbon Steel Nut Size- M6 Nut Socket Size- 11mm Point Type- B Point Recess Type- Cross Substrates- Hardwood, Softwood, Plastic, Steel, Thin Sheet Metal Thread- Fully threaded, Metric