MB3 JJ Part # Description Weight MB2 20" X 30" Mortar Board Stand 15.0 lbs MB3 36" X 30" Mortar Board Stand 16.0 lbs MB4 48" X 30" Mortar Board Stand 20.0 lbs MB5 60" X 30" Mortar Board Stand 26.5 lbs JJ Jiffy Jack (Pair) 26.0 lbs