Profile Racing 10mm-14mm Axle Adaptors
• These allow you to use female bolt-type 10mm cassette hub on your frame with 14mm dropouts, for that clean look. Can also be used on the front if you are still rocking 14mm dropout forks.
• Made in USA from super hard 7075 aluminum, these 3/8" axle to 14mm dropout adapters are much lighter than a steel adapter, but nearly as strong.
• Aluminum adaptor and steel washer."