The FCS Softboard Plugset is perfect for converting your softboard into a higher performance softboard. They are super simple to install or to use as a replacement for the fins that come in some softboards. What's so awesome about this plug set is that you can use any FCS Fins with them. Pretty cool stuff! Thruster (3) set of plugs only; fins sold separately, all black. The measurement between the plugs is 2-1/8", center to center.