Product Description: 1. Function: Heavy-duty design for removing, installing or manipulating the large internal or external retaining ring in transmission cases. Also, as a great helper for intensifying force, such pliers give a stronger grip, helping us removed snap ring with minimal effort and added safety. 2. Fitment: This internal retaining ring pliers is designed for GM 5L40, 5L50, 6L50, 6L80 and 6L90 transmissions to remove and install the large internal retaining ring and snap ring in transmission cases .