An extension table fits snugly against your sewing machine, giving you a much larger work surface Extension tables provide extra support for your sewing and quilting projects. Measures 8" x 11.5" Resin Extension Table For Janome CoverPro Machines. An extension table fits snugly against your sewing machine, giving you a much larger work surface. Extension tables provide extra support for your sewing and quilting projects. Extension table measures 8" X 11-1/2". For Janome models : 900CP, 900CPX, 1000CP, 1000CPX Genuine Janome Parts #795812008