IMS B642TH22N. MS Precision Shower Screen specifically designed for Lelit and Ascaso 57mm group head portafilters I.M.S. produces a range of competition filters designed to bring out the best in your coffee. The SHAPE and PERFORATION have been designed to ensure ideal coffee extraction. The filter is bright and polished all around, even inside the holes. The bright and polished surface prevents dirt from adhering to it and facilitates cleaning. A filter without coffee residue allows for extracting only freshly ground coffee, rendering this phase of the process faster and safer, always guaranteeing an optimal result. The actual capacity of a filter depends on many factors such as the coffee grind or the space that is left between the coffee puck and the showerhead screen.