Double Slotted Roofing Bolt Complete With Square Nut. -Finish: Zinc Plated. Fully Threaded. -Low Profile Cross Slotted Mushroom Head. -Clearance Hole Size Is Usually 1Mm More Than The Bolt Diameter. -Suitable For Both Interior And Exterior Use. -Can Be Used On Many Diy Projects Other Than Roofing.PTDFORDIR25RBN630
