The Timco Concrete Screws are high-quality multi-fixing screws made of carbon steel, grade 8. With a 7.5mm thread size and available lengths ranging from 40 to 200mm, these screws are perfect for various DIY projects. The yellow zinc finish adds durability and protection, while the flat countersunk head with ribs ensures a secure hold. Each pack includes 20-100pcs of screws and a TX30 S2 bit for easy installation. Made in the United Kingdom, these screws are a reliable choice for all your home improvement needs.