Item Type: Square Drive Self Tapping Screw Material: Carbon Steel Color: Silver Use: Widely used in outdoor gardens, fences, docks, balconies, courtyards and other large pieces of wood and plastic craft products splicing Package List 100 x Square Drive Self Tapping Screw 1Carbon Steel and Zinc Plating: Our fine thread self tapping screws are made of carbon steel with blue and white zinc plating for rust and corrosion resistance. 2Surface Hardness: The fine thread tapping screws have a surface hardness of 500 to 550HRC, which is in good tenacity and can be strong and durable. 3Square Drive Design: The head of this fine thread tapping screw is designed with square drive, which can be operated by corresponding screwdriver. 4Incisive Tail: This fine thread screw has a incisive tail for tapping into various kinds of woods and can work easily. 5Not Easy to Damage: Our fine thread tapping screw is not easy to damage the screw head even when tightened hard, which has high practicality.