Roofing Bolts with Square Nuts - Zinc M8 x 100 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. Included Items M8 Square Nuts Finish Zinc Nut Socket Size (mm) 13 Recess Type Cross Substrates Hardwood, Softwood, Plastic, Steel, Thin Sheet Metal Head Type Dome Corrosion Rating (1-5) 1 - Clean, dry & low humidity environments Thread L (mm) 100 Material Carbon Steel Pack Type Box Point Type B Point Nut Size (mm) M8 Nut Type Square Head Ø (mm) 19 Thread Ø (mm) M8 MOQ Increment 1 Thread Type Metric MOQ 1 Thread Coverage Fully Threaded