Tried, tested, and trusted for years by climbers near and far, Black Diamond Anodized Stoppers belong on every trad climber's rack. From granite fissures to sandstone cracks, these nuts feature a transverse taper, which is fancy language for their ability to work in flaring crevices and asymmetrical constrictions. When your buddy oversets one of these stoppers on a scary lead, you'll appreciate the rounded edges which make these chocks much easier to clean than other passive protection. Embrace the gear that ushered in the clean climbing revolution and invest in these Anodized Stoppers.