Emulating the iconic design of the Stem Gem, the Hullster was specifically designed to core tomatoes quickly. Push the button to extend the stainless steel serrated blades. Insert around the core, release the button and twist. the core comes out quickly and cleanly, perfect for canning or making stuffed tomatoes. Features: Designed to remove tomato hulls quickly and easily Serrated blades grip to remove core cleanly Press the green button to activate the stainless steel blades Works with both large and small tomatoes including the cherry variety Top-rack dishwasher safe