You handle your machine's portafilter every day. Upgrade your most-used accessory with this Pro Bottomless Portafilter for Rocket Espresso and other E61 group machines. Each stainless steel portafilter is designed with an open bottom for improving your shots and a textured, slanted handle for better in-hand feel. Better, swap out the classic textured black handle for custom wood options in maple or walnut for an upscale look. 58mm diameter with a 21g triple basket.