These threaded inserts worked out perfect for my project. One suggestion for installing them is to screw two onto the bolt you will be using. You can drive the insert using the bolt, in my case I was using threaded knobs. The purpose of stacking two inserts on the bolt is so you can sink the insert flush. Then just back out the bolt and the bottom insert will stay in the wood. I also used a 1/2 inch bit

My only issue is finding a more straightforward way to insert these straight. I've seen some DIY jigs that make this easier. Will try them.

I used several of these in red oak for mounting electronics. Wood was so stiff I ended up cracking the top of the brass insert. Used a squirt of WD-40 on the threads and that helped a lot. They are not going to move.

Biggest drawback is it is very difficult to keep the inserts perfectly straight while driving them. For larger threaded inserts this usually isn't an issue, but it matters for #4-40. Of the 18 I used, only one was not usable due to alignment. Overall I am pleased with the results and these inserts worked as advertised.

Just what we were looking for

I read plenty reviews. These work great if you prepare correctly. If going into hardwood. Do NOT use a drill to install these. Their brass and will get chewed up. Key to install. I tried several ways. I'm very knowledgeable on this stuff and there really is only way way to make a successful install. First hole size. You need 33/64 for the 3/8. Second you MUST get the install tool from company. It's an additional 15 bucks. But is only way your getting them in. Here is the trick. You MUST rub the threads of insert onto a candle. Wax up the threads. Will go in easy. Other thing is use install tool with a ratchet and small extension. It's the only way to keep even pressure. And will go in straight. Put one hand on extension and ratchet in. Insert will not keep chewed up this way and your install will look great.