Our bean slicer is also known in German as a "bohnenschneider". Made of cast aluminum with a protective food-safe coating, it easily clamps to any surface up to 1.25" thick. To use, simply feed fresh green beans into the hopper. As you turn the crank, the stainless steel cutting blades will slice beans into slender, French cut slices.s will slice the beans into smaller pieces. Hand wash.