Features: *Blind Filter Basket for back flushing, 3 Sizes avaliable, 51mm, 54mm, 58mm. *Blanking disk allows you to back flush the brewing group, removing build up of ground coffee and coffee oils. *Suitable for most coffee machines in the market. *Made of high quality stainless steel, and safe. Specifications: Product Name: Blind Filter Basket Material: Stainless Steel Color: Black Size: 51mm, 54mm, 58mm Semi-automatic coffee machine brewing head cleaning: 1. Firstly remove the coffee machine handle filter, remove the coffee machine handle filter, then put the blind bowl into the coffee machine handle, then put a small spoonful of special cleaning powders for the coffee machine, press the brew button, run for about 10 seconds, and then turn off. 2. With an interval of 20S, repeat the above about 5 to 6 times until clean water is discharged. 3. Remove the blind bowl, replace with the filter, press the brew button, and continue to rinse several times. Package Include: 1Pc Blind Filter Basket. Note: Please be sure to verify the size before you order the item. Other accessories demo in the picture is not included. Please refer to the measurement. Tiny measuring error is allowable in normal range. There might be a little color difference due to the monitor, camera or other factors, please refer to the physical item.