The Bulky Seam Jumper levels your presser foot and keeps it horizontal so that you get consistent stitches when sewing over seams and bumps. It has 2 thickness options: one side is ⅛ inch, and the other 3/16 inch. Allows you to handle a variety of seam or bump thicknesses with ease. Other Uses: The Bulky Seam Jumper can also be used as a shank to sew buttons in place with your sewing machine. In addition, the Bulky Seam Jumper has a built-in needle inserter which makes it easy to insert the needle into your sewing machine. This tool is a must-have for sewists, quilters, crafters and makers! It makes sewing bags, straps, jeans, upholstery, quilts and more so much easier! Specifications Size: 2 ¾ in x 1 in x 3/16 in Two thickness levels: 1/8 in and 3/16 in Material: Durable hard plastic Instructions & More A detailed insert is included with the Bulky Seam Jumper. For additional instructions, pictures and video, see our: Bulky Seam Jumper Online Manual.