What are the dimensions of the tamper? March 19, 2019 18:30 Updated Follow The tamper is 2.5" x 2.5" x 3.5" The diameter of the base is 58.4mm. Related articles Will the tamper fit my hand? Does the tamper work in all portafilters? What makes the tamper so special? Is the tamper dishwasher safe? What is Barista Hustle Tools?