Expamet's PT225 Powertie is their Type 4 Housing Tie, suitable for most dwellings and extensions (up to 10m high, not more than three stories).The Stainless Steel PT225 Powertie is designed for cavity sizes 75mm - 100mm. Please see our other listings for different cavity sizes.Specifications:Material Stainless Steel 1.4301 to BS EN10088-3:2014Product Type Type 4 Housing TieMaterial Gauge 2.3mmWidth/Wing Length 28mmFeatures/Benefits Type A to Part E of the building regulations (suitable for party wall construction). High tensile corrosion resistant stainless steel. Safety End prevents injury.