M3*8 Sunk Hexagonal Socket Screw 100pcs For 3D Printing Gimbal Kit Standard: DIN7991 . Material: Alloy Steel . Surface Treatment: Black Anodize . Hardness Level: 10.9 . Screw Pitch: 0.5mm . Diameter: 3mm . Length: 8mm . Usage:Assemble RC quacopter and its accessories . Package Included: 100pcs x M3*8 Sunk hexagonal socket screw