Overall dimensions are 27 x 27 x 11. Cradle is 15 1/2 x 11.
Cradle height is adjustable for different fibers.
Here are the teeth in the lower section (upper section held out of the way).
And here is the upper section. (Light colored blocks are just propping this upper section up high for the photo.) When you use it, you use one hand to push the fiber under the front bar (keeps your hand away from the teeth) while swinging the top cradle with the other (the handle is at the top of this photo).
This handmade swift holds skeins from 39 1/2" to 56". Overall height is 33".
Here are the two separate pieces. The center axle is a little slanted but it does not affect performance. I don't think I'd use this with silk, but it is smooth enough for very fine wool.