The knock box is robust and perfectly suitable for the professional use. The rubberized handle can be grabbed ergonomically from the top over the entire width. The drawer base stands on two solid rubber bars. Additionally, the drawer has a screwed rubber buffer at the front side. PVC rails inside allow a quiet and smooth pulling out and sliding in. The knock bar is made of aluminium and is only connected with the knock box drawer via a silicone coating. Hence, the knock will not be transferred to the housing which makes it very low-noise.