Hipshot string bender. Used in open tunings use of the levers allows otherwise impossible note reaches and sounds. Slightly like a pedal steel especially with a volume pedal. Intuitive. B, G and A string levers. Bent handles for comfort, pads under the set screws ensure quiet playing. You need this on at least one of your teles.
Ideally requires modification of the bridge and a string retainer - see picture. Hipshot includes tubes to protect the string as it slides through the bridge hole. This is a pain, and can wear out leading to breaking strings.
Here's some examples: