Right and left extenders are easily identifiable with unique L and R markings.Use this set with any 9/16 inch threaded pedals to extend the pedal position outward by 17mm(0.71 inch). It prevents knee strain and rubbing against the rear tire/frame.Made of high quality steel and titanium material, the pedal spacers are anti-rust and durable.The length of the spacers are 3.2cm, width is 1.8cm, height is 1.8cm.They are suitable for bikes and bicycle.Item Name: Pedal SpacersMaterial:Steel,TitaniumSize Details:Size: 3.2cm x 1.8cm x 1.8cm/1.26" x 0.71" x 0.71" (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:2 X Pedal Spacers(Left + Right)