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Concrete Masonry Screw Stainless Steel Countersunk Fastener with Torx Drive. Direct mechanical fixing into a pre-drilled hole. No separate expansion sleeve required. Concrete-cutting thread profile. Countersunk head for flush installation. Six-lobe drive for positive bit engagement. Stainless steel construction. Suitable for compatible countersunk fixtures. Different diameters and lengths available. Suitable for pre-positioned or through-fastening, subject to specification. Custom dimensions, marking and packaging available.