Summary

This Is a Subwoofer Box port used for Subs 6" -6.5" -8" -85" -10"
This requires Screw, unless you decide to glue it your choice.
You can change the size of the Port if you want too, Remember to get the right Size for the right sub/Watt
This was made using Tinker Cad.

Dimensions
Height: 4.1" / 105MM
height: (inside port) 1.9" / 48MM
Length: 4.1" / 105MM
Length: (Port Tube) 2.7" / 70MM
Screw Size: https://www.amazon.com/Mini-Skater-200PCS-Tapping-Assortment/dp/B01N5FWUCR/ref=sr_1_10?crid=37HUMKFUDD533&keywords=0.5CM+screw&qid=1660520970&sprefix=0.5cm+screw%2Caps%2C281&sr=8-10