OE specification design makes it fit well while ensuring high stability. Our bellow can provide protection for stern drive shift cables.Good compatibility enables it to fit various boat models. Rubber structure design makes it flexible and not easy to deform.It is made of quality stainless steel and rubber materials, which is tough and durable.Length is 11.3cm, bottom inner diameter is 3.65cm, bottom outer diameter is 3.9cm, top outer diameter is 1.3cm.It is compatible for Mercruiser Stern Drives R, MR/for Alpha One/for Alpha One Gen II/for Bravo I,II & III.Item Name: BellowsMaterial: Stainless Steel,RubberOE: 74639A2Features: Anti-rust, Sturdy, CompactInstallation Location: Near The Stern DriveSize Details: Length: 11.3cm/4.45" (Approx.)Bottom Inner Diameter: 3.65cm/1.44" (Approx.)Bottom Outer Diameter: 3.9cm/1.54" (Approx.)Top Outer Diameter: 1.3cm/0.51" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bellow2 x Stainless Steel Clamps