Will Howardwrote a review of Black Diamond Stopper Set Pro #1-13 on December 17, 2014
Familiarity: I've used it several times
You know the feeling; lots of surface contact and friction, a nice constriction, placing it horizontally or vertically... You can't beat a bomber nut placement, and surely these are some of the best to use. If you're just starting to build a rack, this is a great place to start from for cost efficiency and versatility. You really don't want to fall on the little guys, but they'll slow you down more than nothing would. While it's tough to demarcate differences in hunks of metal, the BDs are my go to, and are surely a solid choice to build a rack from or add some pro to your existing one.