You've found a vintage Rival Grind-O-Matic replacement part for model 2100M 1, 2100, or 2700 meat grinder. This screw-on aluminum retaining ring has general wear and discoloration from normal use. It measures just over 2 5/8" across at its widest, and a little over 2 1/4" diameter on the inside (measuring on the opening that is closest to the motor, not the opening that faces the outside. The listing is for the retaining ring only (the manual shown is only for reference). It is interchangeable with plastic rings for the same machines.
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