Black Diamond - Camalot C4A cornerstone of climbing since 1987, the Black Diamond Camalot C4 remains a go to cam for climbers around the world. With its simple and reliable double axle design, the C4 offers a versatile range of active and passive placements with an impressive expansion range. The integrated thumb loop can be clipped short for aid climbing and equalisation, while the standard sling is adequate for most placements, saving valuable quickdraws on longer pitches.