1) Sewing machine 
A zigzag stitch is variant geometry of the lockstitch. It is a back-and-forth stitch used where a straight stitch will not suffice, such as in reinforcing buttonholes, in stitching stretchable fabrics, and in temporarily joining two work pieces edge-to-edge. When creating a zigzag stitch, the back-and-forth motion of the sewing machine`s needle i....
Z-shaped stitch that can be used on knits, stretch fabrics, to sew buttonholes and as a finish for raw edges.