250pcs Self Drilling Bolt M4.8x13 M4.2x19 M4.2x38 Cross Bolt Carbon Steel White Zinc Plated Bolt Feature:1. Screw type: these screws are self-drilling round head screws, with standard size 4.8x13mm,M4.2x19,M4.2x38, total 250 pieces one package for use2. Fully Threaded: These screws are fully threaded for excellent retention and greatly secures the material on aluminum or metal plates3. Corrosion-resistant housing: These screws are galvanized, providing excellent rust-resistant and corrosion-resistant housing4. Carbon Steel White Zinc Material: These Round Heads/Countersunk Heads/Hex Heads Self Drilling Screws are made of carbon steel white zinc, which has a long-term durability5. High stability: these screws are strong and durable, with stable performance, can be used with screw gunsSpecification:Item Type: Self Drilling ScrewMaterial: Carbon Steel White ZincExterior Treatment: GalvanizedPacking List:250 screw drilling screw inNote:Pay attention to the correct operation.1) we accept Alipay, West Union, TT. All major credit cards are accepted through the payment processor's secure escrow.2) payment must be made within 3 days of placing the order.3) if you are unable to check out immediately after the listing ends, please wait a few minutes and try again, payments must be completed within 3 days. About Shipping1.