Camp Ballnuts (previously known as Low Balls) are the smallest active protection devices available. They are small enough to fit where standard cams won't, and because of their spring loaded holding power, will set in places where you just can't get a chock to stay. Use them in in horizontal or vertical, parallel sided, small cracks.

Expansion range ratio of 2:1 in each of five sizes. Suitable for cracks ranging from 3 to 18 mm. Sold individually.