General description The Concrete Frame Screws are self-tapping, made from zinc plated hardened steel, and designed for easy installation into masonry or concrete walls. This pack contains 100 screws, each measuring 7.5mm in diameter and 92mm in length. They are ideal for fixing window and door frames without the need for anchors or plugs. Technical specifications Material: Zinc plated hardened steel Size: 7.5mm x 92mm Recommended screw diameter: 6.5mm Usage Designed for fastening window and door frames to masonry or concrete walls Can also be used with roofing Other information Heavy-duty screws with good holding power Galvanized alloy steel suitable for generally dry environments The zinc plating offers temporary rust protection