Sherardised ring shank nails grip harder than any plain nail. The annular rings around the shank bite into the timber and lock, giving much higher pull-out resistance, so decking, flooring and sheathing stay tight. The sherardised coating (corrosion rating 2) suits sheltered exterior work. Carbon steel, 40mm to 100mm, sold loose by weight, conforming to Eurocode 5 service class 2.