20Pcs Brass Barrel Hinge Hidden Invisible Concealed Hinges for Jewelry Keepsake Box Cabinet Door Barrel Hinges

Worked like a charm. Replaced failed pot-metal hinges on a tea box.

I purchased these 4mm hidden barrel hinges for a ring box. I scoured the internet for instructions and found none. Here is how I installed them.My box has a ¼” wall thickness. I drilled a 4mm hole in the center of the wall and 3/8” deep. The depth of the hole needs to match the length of the barrel from the pivoting pin to the end. Then I routed a 45 degree chamfer along the hinge side of the box on both the top and bottom pieces to allow the lid to open 90 degrees. The chamfer needs to remove the wood back to the center of the holes. Then I glued the hinges in with a little CA glue.I strongly recommend that you mock up the project on scrap wood as I show in the pictures. I also recommend using brad point drill bits to make sure you hit the exact spot for your holes.

Nice hinge for a small box. There are no instructions on how to install these anywhere that I can find either on Amazon, internet or YouTube. These hinges require a substantial chamfer be cut into the lid that passes through the center of the hinge pin for the box to open properly. You may or may not like this look so it's good to know before you buy these.Here is how I installed them:1. Offset two 4mm holes 1.5mm fro the back of the box. Hole alignment is critical so I actually drilled the holes in the side/rear of the box before I installed box top and bottom of the box so I could achieve that perfect alignment.2. Glue the top and bottom on the box to covers up the holes so they are hidden.3. Cut the top off the box.4. Chamfer the back of the box top and bottom where the hinges get installed a minimum of 45 degrees with the chamfer extending at least to the center of the pin hole.5. Glue in the pins with small amount of wood glue into the bottom of box. Rotate the pins so that they will bend straight out the back and insert into the holes in the lid.6. Wipe up any squeeze out, then open and close the box a few times to make sure the alignment is correct and making sure it sits flat.7. Prop the box slightly open and let the glue dry and you are golden!I also finished the interior of the box and the edges before installing these hinges so the glue wouldn't stick to the box. I did a light sanding after the glue was dry and finished the outside. Be careful not to sand through the back of the box and expose the hinges as there is only 1.5mm of material! Don't ask me how I know...

Great price, fast delivery and exactly what I was looking for to use in making small jewelry boxes

The swivel pin in the middle is very light. Use with only small boxes.

If you have not used this type of hinge before I would practice on scrape wood before using. Requires back beveling to open properly. Wanted to try them as hidden hinges but having to have the bevel defeats the purpose for me.

Incredibly poor quality and inconsistent dimensions. Pins missing from many of the hinges, others bind and do not pivot properly. Length and diameter aren't very consistent from piece to piece. From the package of 20, 2-4 of these are actually usable. Don't waste your time with this trash.

well suited for small cabinetry work. The hinges are hidden and sturdy for lightweight woodworking projects