320 PCS M3 M4 Black Round Head Self Tapping Screws

【Strong and Durable】: The black screws are made of high-quality carbon steel, whose surface is black zinc plated. Therefore, the hardness is high, which can be used for a long time. 【Quantity】: M3x8 (40 pcs), M3x12 (40 pcs), M3x16 (40 pcs), M3x20 (40 pcs), M4x10 (40 pcs), M4x16 (40 pcs), M4x20 (40 pcs), M4x25 (40 pcs), 320 pieces in total. 【Sharp Threads】: The screw threads are very sharp and are not easy to deform and slip during installation. It has good fixing performance after installation. 【Easy Installation】: The self tapping screws adopts a design of cross-round head, which can be directly locked on the wooden board, which has high strength and is not easy to break. 【Wide Range of Uses】: The clamping force of the screw is good. Therefore it can be used for computer, electrical appliances, furniture, cabinets, toys maintenance and installation.