Unsichtbarer verdeckter Reißverschluss aus Nylon 7"" bis 20"" Reißverschlüsse 18 bis 50 cm Farbauswahl
The key is to get the needle as close to the fastener as possible, which this foot accomplishes by slightly unrolling the zipper just before the needle. Breaking strength of the product can be varied with respect to individual applications.