No assembly required. The mast of the table pivots and can be locked in one of the 3 positions from flat on the floor to 90 degrees. The pivot feature allows the tabletop to be positioned closer to individuals in a bed sitting in a wheelchair or folded for storage. The tabletop tilts with the angle of the mast 4(ea.) 2 casters (2 locking) Color: grey tabletop black frame Dimensions: Tabletop 23.5 W x 15.75 D Height adjusts: 28 - 37 Base measures 25 x 25 Limited Lifetime Warranty