6 Cylinder Piston Ring Compressor with ratcheting plier truck car CP88217E 6 PISTON RING COMPRESSOR SET With PLIER Pliers can be used parallel or perpendicular to the cylinder block Fine-tooth ratcheting lock allows you to compress bands in small increments. Placing a band around the piston, covering the rings and hooking pliers into the band and squeezing. Insert piston into cylinder and tap lightly with hammer handle to install.