1、Constructed of aluminium alloy, which is very durable 2、Lightweight and easy to install and remove 3、​3 different color fits for your demand, meets different needs 4、Perfect for adjusting your bike bottom bracket, flywheel or hub 5、Also can be apply to BB axis Description: Our bottom bracket washer is made of high quality aluminium alloy, which is durable and lightweight to carry. Exquisite workmanship and convenient to install and remove. It is perfect to get a good fit on your bike. Perfect for adjusting your bike bottom bracket, flywheel or hub. You are worth it. Features: 1. Constructed of aluminium alloy, which is very durable. 2. Lightweight and easy to install and remove. 3. 3 different color fits for your demand, meets different needs. 4. Perfect for adjusting your bike bottom bracket, flywheel or hub. 5. Also can be apply to BB axis. Specifications: Material: Aluminium Alloy Package Weight: approx. 25g Thickness: approx. 1.9mm / 0..1" External Diameter: approx. 40mm / 1.5" Inner Diameter: approx. 34.7mm / 1.3" Quantity: 15pcs Package Included: 15 x bottom bracket washers Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please in kind prevail.