UWAS - Short model the neck is 8mm long and the
hole is 9mm diameter for 4mm from the inside.
UWAT-F - Specifically for the very popular ToUcam Web Camera. [Info]
UWAL - Long model the neck is long enough to fit a QC B/W without having to mess with the case. Neck length is 18mm. See vignetting to understand the problems with this. Hole is 9mm diameter from inside half way to the end and then goes to 8mm.
-F - indicates that the 1-1/4 end is threaded for a 1.25" American Standard filter thread
Note 1: Drawing needs updating for UWAT and minor production changes Jan 2001.
Note 2: UWAT is only available with filter thread to reduce the number of versions
Note 3: The barrel of length of all web cam adapter has been shortened from 1.25" (31.75mm) to 1.1" (28.55mm). 1 Sep 03
Universal WebCam Adapter Drawing