Designed with a comfortable palm grip for less arm strain while tamping, it compresses the coffee grounds tightly and evenly. With its built-in spring (30lb), it provides consistent tamping pressure with no additional adjustment needed. The collar along the handle will rest on the basket which ensures a level tamp every time, which also results in better consistency and better extractions. 58.5mm Diameter: Ensuring a snug fit for most '58mm' baskets including VST, IMS, etc. It fits the standard size for the majority of home and commercial machines. Premium material - the tamping base is made from CNC machined to a precise block of 304 Stainless Steel. The black handle is processed by anodized aluminum.