IMS Precision 54mm Portafilter Basket These IMS precision filter baskets are designed for use in 54mm portafilters, like those found in Solis & Breville machines. The slight cylindrical shape of the baskets creates a compact coffee puck and allows for better extraction. The electropolished metal coating makes knocking pucks out even easier, and the 583 0.3mm holes are specifically arranged in a pattern that balances delivery of coffee in relation to the height and shape of the portafilter. Basket Specs Single - 253 holes, 0.3mm each, arranged in E-hole pattern for a balanced delivery of coffee. Double - 583 holes, 0.3mm each, arranged in E-hole pattern for a balanced delivery of coffee. The 54mm IMS Precision Baskets for Breville & Solis are available in the following sizes: Height Capacity Suggested Dose Light Roast Medium Roast Dark Roast 23mm 8–12.5 g 10–12.5g 9–11g 8–10g 24mm 14–20g 17.5–20g 15.5–18g 14–17g 26mm 17–20.5g 18–20.5g 17–21g 17–19.5g 28mm 18–23g 20–23g 18.5–22.5g 18–22g