Accommodates up to 6 full height or 13 half height sieves 8" diameter. Reproduces circular and tapping motion given testing sieves in hand-shaking but with a uniform mechanical action, assuring accurate and comparable results with a uniformity not obtainable in hand-testing. Equipped with vertically mounted, totally enclosed 1/4 HP motor. Meets OSHA requirements. Two bolts mount it on any solid table. Equipped with automatic 30 minute timer to obtain comparable results between two or more tests. Overall: 25 H x 28 W x 21inches deep. Shipping weight: 225 lbs. A sound enclosure is available to reduce the noise level.