Hello. The jack stand has two adjustments. First is the round tube that houses the screw, it can be raised and lowered and locked in place with washer type lock mechanism. The head can also be adjusted up and down by turning the handle located below the V shaped head. Having worked in the Oil Field my entire life and being a welder for many years, for the money these are great jack stands. Heavy duty and fairly priced. You wont regret the purchase. i have 8 of them and love them
By GEORGE2864