ForgeFix FORTFHH5551 TechFast Hex Head Roofing Screw Self-Drill Heavy Section 5.5 x 51mm Pack 100 | Screws & Fixings and the exhalation valve makes

and the exhalation valve makes breathing easier

The tapered end is generally used for hole alignment

storage units

* Inherently flame retardant

Size: 115mm (4 1/2 in)

ForgeFix FORTFHH5551 TechFast Hex Head Roofing Screw Self-Drill Heavy Section 5.5 x 51mm Pack 100 | Screws & Fixings and the exhalation valve makesThese Forgefix TechFast Hex Head Roofing Screws are designed for fixing cladding and sheet steel to heavy section steel purlins of between 6. 0mm and 12. 5mm. The screws have a hex head, are self drilling and have a rubber washer which expands under pressure to form a permanent weather seal. They are zinc plated and have an 'Elementech' coating for superior corrosion resistance, which has been salt spray tested to 1. 000 hours.