Model No. 91903-DR-RLF.

Deluxe, On/Off Ratchet, Ergonomic Modular Handle. 

The Relief Handle has a simple yet effective design. The thumb ring of the handle pivots and adapts itself to the thumbs movement in each direction, without restriction. The thumb is able to follow its natural sequence of movements. Consequently, the leading cause of tension on all muscles  of the surgeons hand, arm and shoulder is greatly reduced.