SCS clamps are taller, 4-bolt clamps that have your compression system built into them. While with a 2-bolt clamp, you’ll have to also use an IHC or HIC kit on your fork, an SCS clamp has everything built into it. The bottom half of the clamp gets installed directly on top of your fork, and the top half of the clamp holds your bars. Because the bars are not going over the fork, they do not need a slit in them. SCS clamps are heavier, and a bit more pricey than double clamps, but they are much more durable, easy to use, and will make your bars last longer due to them not needing a slit in them.