Forgefix 25RBN616 Roofing Bolts and Square Nuts ZP M6 x 16mm (Bag of 25) FORRBN616M

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.