The DNJ ring spec. information, printed on each compression ring (located next to the piston ring gap), is installed facing the top of the piston for both the top (#1) and middle (#2) compression piston ring slots. The oil control ring can be installed just like any other oil control ring in the bottom (#3) piston ring slot.
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It is a spring metal sleeve that goes over a piston to compress the rings so that the piston can be install in the motor. It tightens down on the piston, forcing the rings into the grooves in the piston then you tap it into the cylinder.
The piston rings create a seal between the piston and the cylinder wall.
With a piston ring compressor.
Generally in grooves near the top of the piston. The compression rings, near the top and the oil rings at the bottom of the top. The ring gaps are staggered.
On the outside of a piston near its top are two or more grooves that hold steel piston rings. The piston rings are used to form a seal between the piston and the cylinder. The material between the ring grooves is often called the ring lands.