Auto-Klamp Mechanical Thumb (AK) The Geith Universal Auto-Klamp Mechanical Thumb provides an economical and safe solution to solve job-site material handling needs with the added benefit of a unique auto slide system. The auto slide system enables the operator to easily release the thumb to one of the multiple pre-set positions and, when done, fold the thumb back to its store position by turning a lever and curling in the bucket. Available for immediate shipping for a wide range of excavators. Automatically folds and stores away when not in use Quick and easy installation Weld-on base plate with no need to remove main pin during installation No additional hydraulics required Auto-slide system for fast thumb deployment AR 400 steel throughout provides strength, durability, and abrasion resistance High strength mounting pins and one piece base plate Over sized high profile pivot pin prevents twisting