Black Diamond Camalot X4 Double axle (in 0.75, 0.5, 0.4 sizes) or Stacked Axle (in 0.3, 0.2, 0.1 sizes) provides unparalleled expansion range Narrow head width. Cam springs embedded in the cam lobes allow for ultra narrow head width that fits in more places than ever before Armored cable - Aluminum beads add protection and durability without compromising stem flexibility. Hot Forged trigger bar for great ergonomics and durability not possible with a cast trigger bar. Size range.1 - 0.33-0.54in (8.4-13.8mm) .2 - 0.39-0.65in (9.9-16.5mm.3 - 0.49-083in (12.4-21.2mm).4 - 0.61-1.05in (15.5-26.6mm) .5 - 0.78-1.33in (19.8-33.7mm).75 - 0.94-1.62in (24-41.2mm)