The Knock Box Drawer S Polished is designed for commercial and home use. The Knock Box Drawer S Polished is made of heavy stainless steel and features a inside slide rail. The aluminum knock bar is covered with food grade silicone which sits firmly in place and can easily be removed for cleaning. It's extremely shock and noise absorbant due to its solid rubber feet and protects your work surfaces.The knock drawers are great for efficient and professional disposal of coffee grounds. These drawers are a perfect and solid support for grinders or domestic espresso machines, they are great space savers, unobtrusive and do not requiry any kind of installation.