M4 x 18mm Flat Head Socket Screw | Grade 10.9 Black Countersunk Hex Drive Bolt | Metric M4 Fastener for 3D Printers CNC Robotics Flush Mount Hardware

Description ✅ M4 thread – 18mm length✅ Flat countersunk head – sits flush with surface✅ Hex socket – fits 3mm Allen key✅ Grade 10.9 alloy steel – strong and wear-resistant✅ Black oxide finish – corrosion protection and professional look