Hastings 3.375" Bore +.040" Over Size, Single Cylinder Ring Set with 1/8" Top Ring, 1/8" Second Ring, 1/8" Third Ring and a First Oil Ring is 3/16".
This Hastings Single Cylinder Ring Set does not specify Ring Material or Ring Surface Treatment

Application Summary:

Year Make/Model
1916-1927 Ford Model T
Attributes
1st Oil Groove 3/16
2nd Groove 1/8
California Proposition 65 No
Engborein 3.750
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 1/8
GTIN 00075538046417