Sharper Image Adjustable Mandoline Slicer Stainless Steel 3 IN 1 The Sharper Image 378 Stainless Steel 3 in 1 Adjustable Mandoline Slicer is a mandoline slicer that can be used for hand held, over the bowl, or stand slicing. It has a food holder to protect fingers while slicing and non-skid feet. New, Open Box. Never Used.