Roofing Bolts with Square Nuts - Zinc M8 x 30 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 Head Type Dome MOQ 1 Corrosion Rating (1-5) 1 - Clean, dry & low humidity environments Size (mm) M8 x 30 Pack Weight (kg) 2.01 Point Type B Point Nut Socket Size (mm) 13 Nut Size (mm) M8 Material Carbon Steel Nut Type Square Substrates Hardwood, Softwood, Plastic, Steel, Thin Sheet Metal Thread Ø (mm) M8 Thread Type Metric Head Ø (mm) 19 Recess Type Cross MOQ Increment 1 Thread L (mm) 30 Finish Zinc Thread Coverage Fully Threaded