Mechanical Sieve Kit designed for reliable grain size analysis. Five interlocking 2"-dia. x 1-3/8"L clear acrylic cylinders stack inside the 4"-dia. x 14-1/2"L ABS plastic frame. The kit has 20 interchangeable stainless steel mesh wire screens that are graduated to U.S. Bureau Standards. The mesh sizes are 4-270. Shaking the assembled unit distributes the different size particles so that the percentage of volume can be read directly from the graduated support frame.