Dritz Hand Needles for sewing, quilting, doll making, embroidery, and more. Upholstery Home Curved 4pc- The 3" and 4" needles are for slip stitching and attaching outer-fabric sections. 5" for seat work and box edges. The 6" is for edge rolls and stitching burlap to springs. These needles are the perfect implement for upholstery projects.