This Stand Steady sit stand desk riser has a spring assisted lift mechanism that will let you rise and lower almost effortlessly. It can be lowered down to 8 inched and can be raised up to 20.5 inches, you will be able to set the height anywhere between 8” and 20.5”. It also has a 35 pound weight capacity and is in excellent condition. It measures 37.5Wx24Dx8/20.5H.