There are 5 sizes to accommodate all size wires. Can be used to shorten or store USB or power cords, even lamp cords. Very nice for travelling.
The design offers very nice finished prints with no elephant foot. Short print times and 5 sizes. The sizes are labeled for diameter in mm and height. The screws are all the same size and are easily tightened by hand or with a quarter size coin. Tightening the screw will not pinch the wire.
The screws are ACME type and are design to offer smooth twisting.