Allgrip Roofing Bolt & Square Nut 8 x 30mm, BZP, supplied in a box of 100.
Roofing bolts have a mushroom head with a slotted drive and are supplied with a matching square nut. Used for fixing corrugated sheeting, gutter brackets, cable tray and light steel where a low profile head is needed on the outside face.
Fit with a washer under the nut and do not overtighten on soft sheet material.
