M12 to M8 Thread Adapter - Thread Inserts 20Pcs 302 Carbon Steel Self-Tapping Thread Insert Screw Repairing Accessories(Inner M81.25 Outer M121.5: 15mm / 0.6in). ★Reinforced strength --- The self-tapping screw sleeve does need to be tapped in advance, and can be directly screwed into the specific hole reserved for the base material.
