Roofing Bolts with Square Nuts - Zinc M6 x 16 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. Head Ø (mm) 14 Thread Ø (mm) M6 Nut Socket Size (mm) 11 Nut Type Square Recess Type Cross Included Items M6 Square Nuts Thread L (mm) 16 Substrates Hardwood, Softwood, Plastic, Steel, Thin Sheet Metal Finish Zinc MOQ 1 Head Type Dome Nut Size (mm) M6 Thread Type Metric Corrosion Rating (1-5) 1 - Clean, dry & low humidity environments MOQ Increment 1 Point Type B Point Material Carbon Steel Thread Coverage Fully Threaded