You are using a web browser we don't support. Please use the latest version of one of these browsers.

Mozilla Firefox

Google Chrome

Apple Safari

Microsoft IE

Back to top
Size 0
Size 0

Please select a size/color.


  • Explore a new world of placement possibilities with the revolutionary, patent-pending interlocking cam design, even fitting tight pin scars with ease
  • Uses up to 30% less head width than other three-cam units, fitting in a far greater number of places more securely
  • Independently driven by patent-pending compression drive springs for increased holding force in tough placements
  • Huge cam stops prevent over-rotation and offer ample passive umbrella strength like the double-axle models
  • Easy-to-place ribbed trigger and thumb rest improve handling when arms are pumped
  • C3 cam's stem design is ID-colored and offers superb flexibility and strength--laterally stiff for tight placements and soft over edges
  • Stainless-steel cables are flexible to disperse loads more evenly, minimizing deformation and making cam units inherently stronger
  • Color-coded nylon slings coincide with stem for easy identification

Made in USA.

Made in 5 sizes; see specifications listed below for size = range / strength / weight / color:

  • Size 000 = 7.8 - 12.9mm / 4kN / 55g / gray
  • Size 00 = 9.0 - 13.7mm / 6kN / 57g / purple
  • Size 0 = 10.7 - 15.8mm / 7kN / 59g / green
  • Size 1 = 12.0 - 18.8mm / 10kN / 62g / red
  • Size 2 = 14.2 - 22.6mm / 10kN / 66g / yellow

View all Black Diamond Cams

REI membership


Best Use Rock Climbing
Expansion Range 7.8 - 22.6 millimeters
Strength 4 - 10 kilonewtons
Weight 55 - 66 grams

The REI Difference

100% satisfaction guaranteed

We stand behind everything we sell. If you are not satisfied with your REI purchase, you can return it for a replacement or refund within one year of purchase.

REI's guarantee doesn't cover ordinary wear and tear or damage caused by improper use or accidents.

If your item has a manufacturing defect in its materials or workmanship, you can return it at any time. See our limited warranty.

Gear & advice you can trust

At REI, we live and breathe the outdoors, and we're passionate about sharing our expertise with people of all skill levels. Whether you're new to the outdoors or a seasoned explorer, we'll take the time to understand your needs and help you find the right gear for you.

10% annual member refund

Anyone can shop at REI, but for a one-time $20 fee you can become an REI member and enjoy a lifetime of benefits. These include an annual member refund, typically 10% back on eligible purchases.*



*10% is typical but not guaranteed. Your refund is based on eligible purchases, which exclude REI gift cards, services, fees, REI Adventures trips, REI Garage, and discounted items. Learn more