4 Pc Set - Dry Sift Aluminum Hash Screens  24" X 12" Portable Industrial Strength Trimming and Collecting Screens Awesome set of Aluminum Dry Sift Polyester Screens for drying, trimming, and crystal collection. Make dry sift hash for rosin tec with ease. Wacky Willy's Dry Sift Screen set features 4 different micron sizes: 250, 190, 149 and 75. Dry sift screens are used to collect pure glandular head plant crystals from dried trim, making dry sift, then rosin. These screens will quickly and efficiently extract contaminant from your heads to purify your hash.