What parts does a one-piece insert with an external thread consist of?

Male threaded inserts simply consist of a small, solid tube that is threaded both inside and out.They may come with various other features that usually help with installation:Some models have a ridge around the top; it requires an extra step in the installation process.Some models have cutouts. They are generally self-tapping inserts, which means they require less action to install.The last type of male insert has keys that are pressed in after installation for added security and pull-out resistance.