Hastings 4.000" Standard Bore, Single Cylinder Ring Set with 5/64" Top Ring, 5/64" Second Ring, and a First Oil Ring is 3/16".
This Hastings Single Cylinder Ring Set has a top ring manufactured from grey iron with triple chrome ring surface treatment and second ring manufactured from grey iron with a phosphate ring surface treatment. The 1st oil control ring is manufactured of steel rail/stainless expansion with a chrome rail ring surface treatment.

Application Summary:

Year Make/Model
1980-1981 American Motors Concord
1981 Buick Skylark
1981 Chevrolet Citation
1981 Oldsmobile Omega
1981 Pontiac Phoenix
Attributes
1st Oil Groove 3/16
1st Oil Ring Material STEEL RAIL/STAINLESS EXP
2nd Groove 5/64
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2C5630S
California Proposition 65 No
Engborein 4.000
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
Notes W/Shallow Oil Grv.
SDR Required Flag N
Top Groove 5/64
GTIN 00075538151883