Includes pliers and 7 bands. Pliers can be used parallel or perpendicular to the cylinder block Fine tooth ratcheting lock allows you to compress bands in small increments. Set works by placing a band around the piston, covering the rings and hooking pliers into the band and squeezing. With the band tightly around the piston, insert piston into cylinder and tap lightly with hammer handle to install. Includes blow mold case for storage and organization