Description This 58mm blind filter is used for back flushing on semi-automatic espresso machines that have a pressure release mechanism. It fits into the group handle in place of the standard filter. Back flushing your coffee machine helps to remove coffee residue which builds up inside of the group head. Feature - Color: As shown.- Material: Metal.- Size: 7.00X7.00X1.50cm;/2.75X2.75X0.59in;- This 58mm blind filter is used for back flushing on semi-automatic espresso machines that have a pressure release mechanism.- It fits into the group handle in place of the standard filter.- Back flushing your coffee machine helps to remove coffee residue which builds up inside of the group head.- The blind filter can be used in conjunction with cleaning tablets.Packing list: 1 x 58mm Metal Blind Filter