Piston Ring Installer Remover Engine Pliers 3.125" - 4.750" (80mm to 120mm) Capacity: 80-120mm pistons in diameter Smooth gripping edge Piston Ring Tongs prevents damage to piston ring during installation Nickle plated finish Piston Install Pliers and Plastic handle Universal design Piston Ring Plier can be used on most vehicles, such as cars, truck, motorcyles, ATV's, boats this tool is required as ring manufacturers do not want their rings wound around the piston for installation