OONO Ultra-Small GPIO Terminal Block Breakout Board Module for Arduino Mega-2560

Since parts are small, a little difficult to screw in the supports but, very stable once installed. The terminals worked perfectly and the pins fit snugly without tightening too much. Well labeled. I recommend securing wires before connecting to the Mega board if you’re just transferring. I Highly Recommend.

Installs nicely. Wires connect at edges so important LEDs on board are not blocked. A good jewelers screwdriver is easier to use than the provided screwdriver. The nylon standoffs are fairly delicate so a light touch is needed. Extra standoffs are provided in case of problems.

Works as advertised

Strictly speaking this is a fault with Arduine (Mega 2560). But, these can't be attached to an Arduino because the screw hole spacing on some mounting holes is too close to the headers. One solution would be to use like an M2 screw (or smaller?), but none are provided and the Arduino would have some wiggle room.Be aware these screw blocks also won't work with male breadboard jumpers. You need bare wire ("wire size range 28AWG to 18AWG").

If you have a project where your Mega is wired up in use on a somewhat permanent basis these connectors fit the bill. Nicely made, fit well, hardware is OK. Not a Phoenix, but not the Phoenix price.