Economy Sieve Shaker, which complies with ASTM C136 Standards, the Humboldt Motorized Sieve Shaker can be used with 8", 10" and 12" sieves. 1/4 HP motor handles up to (11) 8" sieves, (7) 10" sieves and (7) 12" full-height sieves; and, (19) half-height 8" sieves, (13) half-height 12" sieves. 1/4 HP motor, 115V, 60Hz with 30 minute timer. Mounting is required. ASTM C136. Dimensions 21w x 18d x 47h" (533 x 4570 x 1194mm) Ship wt. 85 lbs (38.5kg).