eBay IMS B70 2 T H 26,5 M Precision 17g (14-20g) Competition Filter Basket Ridged Competition Filter Basket for best results. Can be used for e.g. E61 Groups, Rancilio, Marzocco, Faema, Elektra, Astoria and many more. **The perfect match for E61 Groups: Shower Screen E61 200 IM** Technical Details: SHAPE: BORDER: Ø 70 mm (B70) - HEIGHT: 26,5 mm (H26) - CORPO: Ø 60 mm for Ø 58.5 - 58.80 mm tamper - Ridgeless - Cylindrical with corner rounding The shape was created by I.M.S. to obtain the proper ratio between the base and height of the coffee puck in relation to capacity. The filter is cylindrical with a convex bottom to collect the coffee towards the center during percolation. This shape has been designed to exploit the whole coffee puck, which also facilitates drying and expulsion. PERFORATION I.M.S. perforation is exclusive and patented - PERFORATED AREA: Ø 44 mm, area optimized in relation to the shape of the filter. NUMBER OF HOLES: 641 Micro spacing (M) The number and distribution of the perforations are designed to balance the delivery in relation to the height and shape of the filter and perforated area. HOLE DIAMETER: 0.30 mm - SHAPE OF THE HOLE: CIRCULAR with CONICAL cross section.