A general purpose nail.
Usually around 50mm of timber substrate is required to get a secure anchoring, although this will depend on the weight and thickness of what is being fixed.
Used for securing galvanised steel sheeting.
The convex washer covers the hole made in the sheet by the shank of the nail.
The twisted shank gives greater resistance to pull out created by the flexibility of roofing materials in windy conditions.
For use with joist hangers and restraint straps.
Can also be used for external cladding and/or felt.
The twisted shank gives superior pull out resistance.