Feature: 1. Carbon 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.2. Hardness: The fine thread tapping screws have a hardness of 500 to 550HRC, which is in good tenacity and can be strong and . 3. Square Drive Design: The head of this fine thread tapping screw is designed with square drive, which can be operated by corresponding screwdriver. 4. Incisive Tail: This fine thread screw has a incisive tail for tapping into various kinds of woods and can work easily. 5. Not Easy to Damage: Our fine thread tapping screw is not easy to damage the screw head even when tightened hard, which has high practicality. Specification: Item Type: Square Drive Self Tapping Screw Package List: 100 x Square Drive Self Tapping Screw |