Hastings 2.834"/72.00 mm Bore +.50 mm Over Size, Single Cylinder Ring Set with 1.00 mm Top Ring, 1.00 mm Second Ring and a First Oil Ring is 2.00 mm.
This Hastings Single Cylinder Ring Set has a top ring manufactured from stainless steel with nitrided ring surface treatment, a second ring manufactured from ductile iron with phosphate ring surface treatment. The 1st oil control ring is manufactured of nitride rail/stainless expansion with a nitirded ring surface treatment.

Application Summary:

Year Make/Model
2008-2015 Smart Fortwo
Attributes
1st Oil Groove 2.00
1st Oil Ring Material NITRIDE RAIL/STAINLESS EXP
2nd Groove 1.00
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2N4149S.50
California Proposition 65 No
Engborein 2.834
Engboremetric 72.00
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 1.00
GTIN 00075538399346