American Educational 3070-6 Screen Sieves Set (6 Piece Set) Set of six sieves provides students in grades 6-12 with hands-on experience separating and grading soil and rock samples Graduated sieve sizes meet USDA soil texture classifications for grading soil Metal sieves and plastic base and lid provide durability and long life Each sieve has 6.5" diameter and 2.5" height Set includes bottom pan, lid, and six mesh sizes