Hastings 3.125" Bore +.060" Over Size, 6-Cylinder Ring Set with 5/64" Top Ring, 5/64" Second Ring and a First Oil Ring is 3/16".
This Hastings 6-Cylinder Ring Set does not specify Ring Material or Ring Surface Treatment

Application Summary:

Year Make/Model
1963-1965 American Motors American
1952-1955 Ford Zephyr
1955 Ford Zodiac
Attributes
1st Oil Groove 3/16
2nd Groove 5/64
Alternate Part Number 690.060
California Proposition 65 No
Engborein 3.125
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 5/64
GTIN 00075538037507