●Best accessories: If the space is too small to install the coupler, this adapter can help extend the distance to create more space. ●Practical: with this adapter, the bicycle stand is not blocked at the back. ●Improved safety: this adapter helps to extend the distance between the towing hitch and bicycle tyres. Then the trailer hitch will not hit the tyre when the bike rotates to the stop. ●Set includes: the adapter set includes: 1 x M10 x 1.0 axle adapter, 1 x 3/8 inch x 26 axle adapter, 1 x M5 axle adapter, 3 x metal disc, 6 x rubber discs. ●Warm tips: M10 x 1.0 adapter is only suitable for M10 x 1.0 full axle (the outer 10 mm fine thread is used for the coupling). 3/8 inch x 26 adapter only suitable for 3/8 inch x 26 full axle (the outer 9.5 mm fine thread is used for the coupling). M5 adapter is only suitable for quick release axles with 5 mm diameter (outer 10 mm fine thread for the coupling. ).