high quality material Sewing machine button plates are made of high quality and sturdy plastic material, hard to break or deform, durable for long time use Sewing Helper Sew with this bulky seam jumper in your sewing tools. Sew buttons in place accurately, glide over humps on straps and make easy work of installing the needle in your sewing machine. Saving your time and effort Easy to Use No shank adapters needed, just slip this hump jumper under the back of your presser foot, it will create a thread shank when sewing buttons in place, bringing much convenience to your sewing work sewing feet For better sewing use thin end for thinner fabrics and thick end for heavier fabric, very helpful to solve your problem with skipping stitches Wide Application Clearance buttonhole reed plates is ideal sewing tools for All Viking Models and All sewing machines