Hastings 3.445"/87.50 mm Bore +.040" Over Size, 6-Cylinder Ring Set with 1.20 mm Top Ring, 1.50 mm Second Ring and a First Oil Ring is 2.50 mm.
This Hastings 6-Cylinder Ring Set has a top ring manufactured from steel with 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
2010 Buick LaCrosse
2003-2004 Cadillac CTS
Attributes
1st Oil Groove 2.50
1st Oil Ring Material STEEL RAIL/STAINLESS EXP
2nd Groove 1.50
2nd Ring Surface Treatment PHOSPHATE
Alternate Part Number 2C5131.040
California Proposition 65 No
Engborein 3.445
Engboremetric 87.50
Hazardous Material Code N
Life Cycle Status Code Available to Order
NAFTA Preference Criterion Code B
SDR Required Flag N
Top Groove 1.20
Top Ring Surface Treatment CHROME
GTIN 00075538002512