Engineered for both standard 58mm and 49mm portafilter baskets, the Blind Tumbler is designed to provide an easy method to redistribute grounds before tamping. Grind directly into the Blind Tumbler, give the grounds a quick stir to de-clump and homogenize, place the tumbler atop your portafilter, pull the plug to release the grounds, tamp, and pull your shot. Please Note: This product is a tumbler, not a shaker, and therefore was not designed to incorporate a lid. If you're looking for our Blind Shaker, you can find it here.