Pivot Hinges, Heavy Duty Hinges for Doors 360 Degree Shaft Stainless Steel Hidden Door Hinge with Screws Invisible Pivot Door Hardware

1. Dig grooves in the corresponding doors and door frames
2. Install top pivot and bottom pivot. Make surethe center of the rotary axis is located in the same straight line, then fix screws initially.
3. Adjust the screw of part 1 to the lowest place and thestainless steel cylinder to the highest place by ascrewdriver, so that it is completely indented into the interior of the panel.
4. Put the steel ball into the round tube of part 4.
5. Put the door to the door frame so that the cylinder of part 3 is put into the round tubeof part 4 and make the cylinder of part 1 correspond to the round tube of part 2.
6. Adjust the restractable pin of part 1 upward, so that the cylinder rises intothe round tube of part 2.
7. Turn the door shaft back and forth, such as the rotation of no sound.
smooth, the screws will be completely tightened, the installation is complete.
8. lf it is not as smooth as you want, then fine-tune the positionof the parts 3 or parts 4 to make it more smooth.