Size1: Length: Approx. 17mm ；Screw hole spacing : 60mm. Size4: Length: Approx. 20mm；Screw hole spacing : 66mm. Size2: Length: Approx. 17mm；Screw hole spacing : 60mm. 1x Exercise Bike Wheel Axle. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
