Twist Nails – Sheradised Steel – Outdoor UseProduct Overview Our 20mm sheradised square twist nails are ideal for securely fixing joist hangers, restraint straps, and light timber to timber connections. These nails are crafted from high strength carbon steel and feature a durable sheradised zinc coating, ensuring improved corrosion resistance for both interior and exterior applications. The square twisted shank design increases surface area and creates a threaded effect within the timber,