Tamper size must match the internal diameter of your portafilter basket precisely. The most common commercial basket size is 58mm, used by La Marzocco, Faema, Rocket, ECM, Profitec, and most other commercial brands. Some home machines use 54mm (Breville), 57mm, or 53mm baskets — always verify your basket diameter before ordering. A tamper that is too small leaves a gap around the edge, causing channeling and uneven extraction. Precision tampers with calibrated depth stops and ergonomic handles are among the most popular Accessories in our collection. A quality tamper is one of the highest-impact and lowest-cost upgrades you can make to your espresso workflow.