250 pcs. Self Drilling Carbon Steel Hex Bolt M4.2x19 Metal Wood Fastener Kit Feature:1. Stronger Fixation: The self-drilling screw has a transparent thread to better ensure a strong attachment and fast drilling.2. Reliable operation: the hex bolt enables easy installation without slipping, has higher accuracy and working efficiency.3. Practical application: it allows for wide application in workplace, electrical product, communication equipment and so on.4. 250 Pieces in Total: 250 pieces screw is included, and the large quantity will meet your diverse work needs.5. Good Material: Adopt carbon steel high quality material which is galvanized and very durable for long-term use. Specification: Item Type: Self Drilling Screw Material: White Zinc Carbon Steel Surface Treatment: GalvanizedProduct Specification: Approx. M4.2 x 19mm/0.75in Package List:250 x Self Drilling ScrewNote:Please pay attention to the correct operation.