4pcs M5x10mm 10.9 Grade Hex Socket Reverse Left Hand Thread Screw Bolt Black

Description: Made of 40Cr Steel material,black oxide finish,hex socket head,left hand reverse thread design. Fixing component, industrial and construction fasteners. To tighten a reverse threaded screw, you turn it counter clockwise.To loosen a reverse threaded screw, you turn it clockwise. Used widely in home, office and factory appliance, communication equipments, ship assembly and other machinery industry.