Self Drilling Hex Head Stitching Screws w/ EPDM Washers for Metal Roofing Sheets (Silver) - 6.3 x 22mm (100 Pack Box) | TCO
50 x Tek Screws 6.3mm x 32mm Self Tapping Roofing Metal to Wood Fixing Self Drilling Screws Hex Head Stitching Bolt with Bonded Washer : Amazon.co.uk: DIY & Tools