E&B Lab, by IMS created The Super Fine filter basket to improve filtration. The basket is designed for medium to darker coffee roasts. It has much higher filtration capacity of 170-μm, compared to usual filtration of 250 to 350-μm. Super Fine basket combines IMS Precision technology with additional 170-μm membrane. SHAPE BORDER: Ø 70 mm (B70) BODY: Ø 60 mm for Ø 58-58.5 mm tamper RIDGELESS PERFORATED AREA: Ø 40 mm NUMBER OF HOLES: 565. Aisi steel 304 - food-safe certified. Number and distribution of the holes are designed to support the filtering membrane and to balance the flow. The basket is designed for BOTTOMLESS PORTAFILTERS. It's height 28mm might not fit most regular - standard portafilters with spouts