I got this set included with my purchase of the 1-11 wallnuts and it's great to have these small sizes, however you have to be careful about using some of the smaller sizes. The 00 and 0 are only rated for 2kN, and is not recommended for taking a lead fall on them. Even the 4kN rated .5 and .75 I'd try to avoid taking a fall even though they could probably hold. These are more for aid climbing and body weight sort of applications. They work great for those however!