Bicycle axle adapter for M10 x 1.0 solid axle universal bicycle trailer coupling Description: 【Fitment】: Bicycle trailer coupler adapter fits M10 x 1.0 quick release shafts, the outer 10mm fine thread is used for coupling. 【High Quality】: Bicycle axle adapter made of high quality stainless steel material, which is not easy to damage. Professional manufacturing with stable performance for long term use. 【Replacement】: Direct replacement of the trailer hitch adapter, no complicated tools required, easy to use. 【Best Accessory】: If the space for installing the coupler is too small, this adapter can help increase the distance and create more space. With this adapter, the bike rack will not be blocked at the rear. 【Increased Safety】: Extension bolts for the bicycle axle adapter help increase the distance between the trailer hitch and the bike tires. This way, the towing eye will not hit the tire when the bike comes to a stop. Size Chart: Screw Hole Diameter: 10mm Screw Head Diameter: 10mm Package Includes: 1 Adapter 1 Metal Washer 2 Rubber Washers Note: Please allow minor error due to manual measurement and different monitors.