With the tamper adjustment, you can set the distance between the base and the handle according to the coffee dose used. The side wall of the base is laser-marked with a numerical scale. To change the position of the tamper, simply loosen the screw on the side with the included wrench and then tighten the screw again. Construction: The diameter of the tamper base is 58 mm. It is made of stainless steel and aluminum. It also features a special non-slip design that makes it easier to use.