These SteamRC Terminator CNC Ball Link Pliers come in 3 size yaw size versions meant to be used with 4.75mm, 5.0mm, 5.5mm link balls which are the most common link ball sizes for 380 to 800 size helicopters. These tools so far come in 4 different color options (blue, red, gray, and pink).
These tools perform very well as expected. They have a locking lever to keep the handles from springing open during storage. Once you undo the locking lever, the tool springs open.
I purchased three of these tools in the 3 different yaws sizes (4.75mm, 5.0mm, and 5.5mm). The one improvement I would like to see is having the yaws size LASER stamped on the tool itself. I personally stuck a label with the actual yaws opening sizes (4.85mm, 5.10mm, and 5.70mm) on the handle (see pics) for easy identification. I would also like to see replacement yaws.