Cyclo ‘Y’ Wrench Ball Ended Allen keys 4, 5 and 6mm AND Cyclo ‘Y’ Wrench Allen keys 2, 2.5 and 3mm
When I first saw the tools first impression was a great idea to have different size allen keys on one tool, also a nice size that fits in your hand well. However, I wasn't sure they would be good in your rucksack when your on the bike due to them sticking out a bit and the overall size compared to the normal style tool that you fold away so I threw them in my bag and went out on a local ride. I was totally wrong as I forgot they were in my bag, also using them was so much easier than the fold away style as the grip you have is much better. They also clip together well so its easier to keep them as a set, they seem well made as I've used them a lot and my friends have as well and they still look brand new.
Overall I'd say a great tool that should be in everyone's bike kit.
The range of key size is perfect, I think it fits every bolt on my bike.
The only thing that could improve it would be if you could twist the allen keys to get into harder places, but id say personally there fine as they are.