Features: Crank Thread Protection: The pedal extender Protect the crank thread of the chainring and increase the distance between the pedals. Effort Saving: Extend the shaft core to achieve the lever law and relieve your burden during cycling . Problem Solving: If you wear a relatively large pair of shoes, it will cause friction between the shoe and the crank, which can also be solved. Wearing Problem Worry-free: Add multiple protective threads for rank thread, so you don'for t have to worry the wearing the crank thread after replacing the pedal. Simple structure, very easy and quick to install and detach. With Unique Marking: Right and left extenders are easily identifiable with unique L and R markings. Specifications: Material: TC4 for Titanium Alloy Color: Black/Colorful/Gold Weight: 27.4g-31.6g(L/R) Size Optional: L and R: 16/20mm Two Combinations: 32mm/16mmx2 Packing: Hard Metal Box Note: 1.Please allow 0-3mm errors due to manual measurement. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Bicycle Pedal Extension