For me, better than a TZ-circle

Draftsmen know the good and expensive circle with wheel
and quick adjustment.
The brand compasses are> 15, by the disc's outer so to. 5
The threaded rods of these circles are quite cumbersome if you have a pen
want to hoop. This only works with a large opening angle or with short pins.
This model, however, is perfectly designed.
The circle is clamped by the red lever (see the top of the hinge).
The supplied adapter ensures that you can Folienstife, felter etc chucking.
Works very well in both small and large radii, even with short and long pins.
Value for money: very good!
Practicality: very good!
Had already given it to this circle of my professional training, I would have
the expensive Blue King not bought. ;-)