Size:3mm welcome to my store , Hope you have a pleasant shopping trip! Features:1.When choosing the thickness, it needs to be measured according to the actual situation, even if the difference is 1mm, there will be obvious differences.2.Exquisite Craftsmanship: The product is made of CNC aluminum alloy material, with fine craftsmanship and light weight.3.Good Experience: The freewheel is used, and the gasket fits tightly without gaps.Specifications:Material: aluminum alloyColor: red, blackThickness: 1mm/1.5mm/2mm/2.5mm/3mmWeight: 2g/pcOuter Diameter: Approx. 42mm / 1.65"Inner Diameter: Approx. 35mm / 1.38"Package List:10Pcs X Bicycle Bottom Bracket WasherNotes:1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow 1-2cm slight dimension difference due to different manual measurement. When Choosing the Thickness, It Needs to Be Measured According to the Actual Situation, Even If the Difference Is 1mm, There Will Be Obvious Differences. Exquisite Craftsmanship: The Product Is Made of CNC Aluminum Alloy Material, With Fine Craftsmanship and Light Weight. Good Experience: The Freewheel Is Used, and the Gasket Fits Tightly Without Gaps. A Variety of Options: There Are Two Colors, 5 Sizes and Thicknesses to Choose From. SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied. When Choosing the Thickness, It Needs to Be Measured According to the Actual Situation, Even If the Difference Is 1mm, There Will Be Obvious Differences. Exquisite Craftsmanship: The Product Is Made of CNC Aluminum Alloy Material, With Fine Craftsmanship and Light Weight. Good Experience: The Freewheel Is Used, and the Gasket Fits Tightly Without Gaps. A Variety of Options: There Are Two Colors, 5 Sizes and Thicknesses to Choose From. SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied.