The screwback only fit on specific 21 GAUGE Threaded post size 0.7mm/ 0.028''!
In order to ensure a secure fit, it's important to match the gauge of the ear nut to the gauge of the ear post.
Pls double check your post size before purchase. Any questions on the srewbacks please feel free to contact our customer service and we will do our best to help you.
Post is not included.
