The inner diameter of the Non-pressurized Porous Filter Basket is 51mm, which is usually relevant to for 51mm Bottomless Portafilter. BUT some 51mm Portafilter of normal usual should not deep satisfactory to insert the Filter Basket. It is strongly counseled that you closely measure the interior diameter and depth of your Portafilter purchasing. The product includes 3 filter out baskets and a blind filter. The intensity of 4-cup Filter Basket is 36mm, the intensity of 2-cup is 25mm, the depth of 1-cup is 19mm, and the intensity of Backflush Blind Filter is 14mm. The product made from chrome steel is safe. It is so easy to clean and handy to use for time. The product is barely magnetic, allowed to connect to magnetic Dosing Funnel. Please learn the product information carefully buying, thank you! Colour: silver Material: chrome steel Package Contents: 1 x Single cup 1 x double cup 1 x 4-cup 1 x Blind Cup 2 x Brush Only the above package content, different item usually are not included. Note: Light and assorted displays may cause the color of the thing in the photograph just a little various from the real thing. The dimension allowed error is +/- 1-3cm.