Use the specified Britmet nails to guarantee that your roofing system is fixed properly.This 2kg box contains, on average, 150 nails measuring 2.6mm by 50mm, designed to drive quickly and easily into the downturns of each tile, locking it firmly in place.Guidelines allow 10 nails per square metre and use them across the entire Britmet system, from panels to flashings and ancillaries. If you're working with Britmet's Plus 0.9mm ranges, it's recommended that you use their dedicated Tek screws.