The Kayfast Thunderbolt Fixings Anchor Bolts are designed to provide a secure and reliable attachment to masonry, brick, and concrete surfaces. Made from zinc plated steel, these anchor bolts feature a hexagon head style and a drive style that can be easily fixed using a spanner or socket. With a metric system of measurement, these round-shaped bolts offer a durable and long-lasting solution for fastening tasks in various industrial and commercial settings.