Gapless 2nd Ring Sets. 2 Cylinder Applications. 1st Oil Groove:3/16 in. 1st Oil Ring Material:STEEL RAIL/STAINLESS EXP. 1st Oil Ring Surface Treatment:CHROME RAIL. 2nd Groove:1/16 in. 2nd Ring Material:GREY IRON. 2nd Ring Surface Treatment:PHOSPHATE. Bore in:2.745. Bore mm:68.58. Tension:STD. Top Groove:1/16 in. Top Ring Material:GREY IRON. Top Ring Surface Treatment:PHOSPHATE.
