Product Name: Hex Socket Button Head Bolts; Material: Alloy Steel; Surface Treatment: Blackening; Performance Grade: 10.9; Color: Black; Dimension: M4 x 12mm; Rod Length(Under Head): 12mm / 0.47'; Pitch: 0.7mm / 0.03' Inner Hex Width: 2.5mm / 0.1'; Screw Head Size: 7.5 x 2.1mm / 0.3' x 0.08'(Dia.*Thickness); Package Content: 100pcs x Hex Socket Bolts Feature: Button head machine screws, hex socket drive. Metric machine screws for universal use. Material: Made of alloy steel, black oxide coating finish, wear-resistant, anti-corrosion, and it is smoother to use. Application: Widely used where fastening is required, the assembly and maintenance of households, machine tools, construction, and DIY projects. Such as household hardware, electrical products, mechanical equipment products, etc.