Hastings 3.228"/82.00 mm Bore +.25 mm Over Size, 1-Cylinder Ring Set with 1.20 mm Top Ring, 1.50 mm Second Ring and a First Oil Ring is 2.00 mm.
This Hastings 1-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
2011-2012 BMW 325i
2006-2007 BMW 525i
2010 BMW 525i
2011 BMW X3
2011 BMW Z4
Attributes
1st Oil Groove 2.50
1st Oil Ring Material NITRIDE RAIL/STAINLESS EXP
2nd Groove 1.50
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2N4108.25
California Proposition 65 No
Engborein 3.228
Engboremetric 82.00
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 1.20
GTIN 00075538399544