Commercial Vibrating Sifter - 15.50 x 4" (Compare to Custom Cones)Automatic Vibrating Sifter Commercial 15. 50 x 4" Sifting your plant material is an excellent way to remove stems automatically. This commercial sifting machine was explicitly designed with processors in mind the stainless steel construction and screens ensure you can easily clean our sifter, and the screen sizes are fine tuned for the most common sifting needs. The commercial grade sifter offers a larger diameter, coming in at 15. 50 inches, compared