This watermelon slicer comes with one automatic cutter blade, just push the watermelon slicer tool into the watermelon, watermelon cubes come out automatic. Watermelon cutting ruler helps you to measure 0-2CM cubes as your ideal size. Stainless steel Watermelon Slicer is a serve easy tool to allow quick cutting and serving of watermelon cubes smoothly and easily. Watermelon gets the cubes you imagined with just one easy step, just push it. Quickly and effortlessly cuts into the watermelon fruit; allowing for fast and easy serving straight out of the melon cube onto the plate.