Arrow's custom acrylic sewing machine inserts are designed to create a flush working surface for your specific sewing machine. These inserts work with Arrow and Kangaroo sewing cabinets. When installed, the acrylic table creates an ergonomic work surface while sewing in the free arm position. The insert fills the gaps allowing for straighter stitches, less fatigue, and an overall better sewing experience. These custom inserts are made of clear plexiglass and designed for two different types of sewing wells: beveled edges and non-beveled edges. Each custom insert comes with an optional adhesive ruler that can be applied. Due to the specific cut of each insert, please be clear in what model you have. For example, some manufacturers have created different versions of the same machine through the years.