ROOF BOLT & NUT M8 X 40

Roofing bolts also know as mushroom head bolts, have a flat head and threaded body and are supplied with a square nut. The head is double slotted for easy tightening or holding with a screw driver. They are mostly used for roofing, but are also used in a lot of other applications. They are ideal for joining metal to metal and they also work for other construction materials.