Diameter: 60mm

For a secure hold when pulling out, I painted the component. So the USB plug sits securely when pulling out a USB stick.

Should a tighter design be better, write me in the comments.

Here the Amazon link to the USB extension: https://www.amazon.de/StarTech-com-USB-2-0-Verlängerungskabel-auf/dp/B00ESZJ450/ref=sr_1_5?__mk_de_DE=ÅMÅŽÕÑ&keywords=StarTech.com+1m+USB+2.0&qid=1556178877&s=computers&sr=1-5