Hastings 3.189"/81.00 mm Bore +.020"/.50 mm Over Size, Single Cylinder Ring Set with 1.50 mm Top Ring, 1.75 mm Second Ring and a First Oil Ring is 3.00 mm.
This Hastings Single Cylinder Ring Set has a top ring manufactured from steel with plasma moly ring surface treatment, a second ring manufactured from grey iron with phosphate ring surface treatment. The 1st oil control ring is manufactured of grey iron with a chrome ring surface treatment.

Application Summary:

Year Make/Model
1989-1991 Audi 200
1991 Audi 200 Quattro
Attributes
1st Oil Groove 3.00
1st Oil Ring Material GREY IRON
1st Oil Ring Surface Treatment CHROME
2nd Groove 1.75
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2D4541S.50
California Proposition 65 No
Engborein 3.189
Engboremetric 81.00
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 1.50
Top Ring Surface Treatment PLASMA MOLY