M5 x 20mm Metric Hex Socket Countersunk Flat Head Screw Bolts Black 20PCS

10.9 Alloy Steel Material 0.8mm Thread Pitch Hex Key Hex Socket Countersunk Flat Head Key Bolts Screws M5 x 20mm. Countersunk bolts is anti-corrosion rustless non-pollution and high-hardness. It is widely used in industrial.