152 Pieces 1/4"-20, 5/16"-18 Threaded Inserts, Nut Inserts, Wood Inserts, Steel Threaded Inserts Assortment Kit for Wood Furniture Screw

Good quality product.

easily threaded into wood to provide a hole which won't wear every time a bolt or screw is removed.

These are definitively high quality metal and seem well-made. The reason for taking off 1 star is that each box (I ordered 2 boxes) has only 15, not the 16 as advertised. Therefore, it's not a mistake.

I love these. They make things easier look nicer.

Great quality and worked as expected, Would recommend.They recommend 12mm pre-drill for the 5/16” ones. After a couple of fits, this may be good for hard wood. If using in MDF or fiber board use a 7/16” or 11.5mm brad point.

Screws into a 1/2" hole and accepts a 3/8" bolt. Very tight fit screwing the insert into the wood that may cause a board to split if inserted near the end. I reamed the holes to make the insert go in easier. A couple were then too loose, but I just added epoxy glue to make sure everything stayed in place. It is a little hard to screw the inserts in perfectly straight. It was not an issue for my application.

I put 6 of these in a 2 x 4 foot 3/4 inch plywood sheet and then added screws to level the it. As a full time RV'er. it is truly hard to find a perfectly level area for my table, so the plywood sheet levels my Gas Grill so eggs don't slide over to the side. I have used most of the 5/16 ones, so the next levelled table I make will have to be 1/4 or buy another set. I recommend these fasteners highly, at least for the purpose I put them to.

Came well packed and with good instructions. i have not used it yet. so i cannot say anything about the quality.