Was using this tool last night, and got me thinking about this sub and one piece tools. It is pretty unique, it's made by a company called sparrows and I believe was designed by 'LockNoob' on YouTube. It's primary function is to remove the Circlips on Euro and Oval style cylinders. I think the half moon cut outs in the back are for installing the circlips and making sure they're seated correctly. But I tend to use a small flat head screwdriver for that task. Thought I'd just share a bit of a oddity to the forum. Which my world of locksmithing is full of weird and wonderful tools. I might make a whole thread about it in the generaltool discussion sub.
(Image removed from quote.)