The sensor mounts are threaded for barrel-type sensors. Sight holes allow you the ability to see the indicator lights even when the sensor is threaded into the mount. The sensor cable can still run back through your swivellink assembly for a clean look and protection from damage. Available in 12mm threaded size. Mounts to AFSB-2XS, AFSB-2XS90, and AFSB-2-2XS.