Forgefix 25RBN830 Roofing Bolts and Square Nuts ZP M8 x 30mm (Bag of 25) FORRBN830G

Supplied with square nuts and have a low profile mushroom head.
Bright zinc plated finish increases resistance to corrosion.
Suitable for both interior and exterior use, and can be exposed to weather conditions without the risk of rusting.
Used in many applications other than roofing, when joining products together.