Slice tomatoes to perfection! This Tomato Slicer and Knife Aid are ideal for those with visual impairment. Safely cut potatoes, onions, and more. Just place the tomato or other vegetable into the slicer and simply cut between the grooves for a perfect slice every time. Use only with a non-serrated knife. Also a perfect prep tool for making blooming onions. BPA-free and dishwasher-safe. The knife measures approximately 8 1/4 in. Slicer measures approximately 4 1/2 tall.