1. Enhance connection strength and improve connection conditions. Rebar couplers are selected from low-strength materials such as aluminum and magnesium, which can avoid slippage and wrong teeth and obtain excellent connection performance. 

2. Wear resistance. Used in frequently disassembled parts, it can greatly improve the service life of the thread. 

3. Increase the bearing surface. It is used in places where strong connection force is required and the diameter of the screw hole cannot be increased. 

4. Anti-loosening. It is especially used in occasions where products such as spacecraft require high insurance coefficients. 

5. Easy to maintain. Install the damaged screw holes into the rebar couplers, and they can continue to be used after repair to avoid the possibility of damage to the workpiece.