One (1) used Ro-Tap Sieve Shaker Model B . Unit operates at 1750 rpm and accommodates 8" diameter or 200 mm testing sieves with any mesh size. Capacity is 6 full height or 13 half height sieves. Shaker is equipped with vertically mounted, totally enclosed 1/4 hp motor and built in 0 to 30 minute dial automatic timer. Easy to install on any solid table with two bolts. Meets OSHA requirements. Dimensions are 28W x 21D x 25"H.