White plastic slide-on tray with "push button" style release. The Slide-on Table, with its practical click lock, offers ample work surface for a variety of sewing projects and allows a little more comfort when sewing. Fits models 530, 550, 570, 580, and 590. Also fits models 430, 440, 450, 630, 640 that have been updated with "new style" front cover.