Lorell LLR81974 is a Sit to Stand Desk Riser which is an adjustable desk riser that can be used to raise and lower your work surface to a more comfortable height. This can be helpful for people who want to be able to stand while they work, or for people who want to be able to alternate between sitting and standing throughout the day. The Lorell LLR81974 has a number of features that make it a great choice for anyone looking for a sit to stand desk riser. It is fully assembled and ready to use right out of the box. It has a large work surface that can accommodate a variety of different tasks.