Protect the crank from damage when replacing the pedals and extend the shaft core to improve leverage and reduce effort. If your feet are relatively wide, it may cause friction between the shoe and the crank, which this product can help resolve. Protect the crank thread of the chainring, allowing multiple pedal replacements without worrying about thread wear. Increase pedal spacing for better comfort. The axle core extender adds 16mm (0.63in) of width on one side, improving comfort for riders with a wider body or hips. Features a reinforced structure with a concave-convex platform for secure installation. The strengthened design ensures safety and durability. An 18mm (0.71in) wrench or adjustable wrench is required for installation and removal. Extension splicing allows unilateral lengthening of the axle teeth; stacking can increase the distance up to 32mm (1.26in). Product Name: Bicycle Pedal Extender Color: Titanium Material: Aluminum Alloy Size: 16mm Package Contents: 1 Pair x Bike Pedal Axle Extenders Note: The package includes only the items listed above. Other products are not included. Note: Lighting effects and monitor settings may cause slight color variations between the image and the actual item. Measurement may vary by ±1-3cm.