8pcs M6x12mm 10.9 Grade Left Hand Thread Bolt Lock Screw for Drill Chuck

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 for Drill Chuck.