The blind filter is used for back flushing on espresso machines that have a pressure release mechanism. This is a standard - and necessary - part of cleaning your machine to keep the channels in the group clear, which makes the extraction pressure uniform.
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This is a 58 mm. blind filter that will fit into your porta filter handle of your espresso machine in place of the brew basket. As described in our article on keeping the group clean, the blind filter is put into the group handle of the espresso machine with some Cafiza powder to backflush the group channels. We recommended 5 cycles of 5 seconds each for a proper backwash, done at the end of each day.
Note that this is for a 58 mm. porta filter. This is the standard size for commercial espresso machines, but please make sure that this is right for your espresso machine prior to ordering.