[Precision Axle Compatibility]Engineered fit C:for M5 Solid Axles to seamless fit with standard bike frames and trailers. Eliminates compatibility concerns. [Anti-Lock Upgraded Design]Features interlocking teeth mechanism to prevent loosening during rides.Superior safety vs conventional smooth- adapters. [Critical Clearance Extension]Adds 15mm+ hitch-to-tire spacing,preventing collisions during turns/stops. Ensures tire-coupler separation for stable towing. [Tool-Free Adjustable Installation]No tools required-installs in Less than 60 seconds.Three nylon spacers customize fit for diverse axle configurations. Color: Silver Material: Stainless Steel Package Contents: 1 x Bicycle Trailer Axle Adapter kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.