Facilitates hemming of garments etc.
The sewing notion is placed on the sewing machine (screwed or with sticky-stuff)
It has a small edge to hold on to and a holder that goes over the hem.
With the help of the screw, the pressure against the fabric can be adjusted
Measure, fold and iron the hem.
Adjust the hem guide laterally for the desired placement of the seam
Open the holder and place the fabric underneath.