Camalot is a popular bran of Spring loaded camming device, manufactured by Black Diamond Equipment, Ltd. There are two types of Camalots, 4-lobed C4s (the original Camalot) and 3-lobed C3s. C4s utilize a patented dual-axle cam system, resulting in a slightly higher expansion range than for a similarly sized single axel unit, and also resulting in increased strength, allowing placement as a passive stopper. C4s range from the small #0.3, to the rarely seen massive #6. C3s, a more recently released line, are single axel units designed for smaller, narrower placements, and range from a tiny #000 to #2. There is some overlap between the C4 #0.3 and the C3 1 and 2. As with most microcams, the C3 #000 is rated for Aid climbing only.