The Rotary Lift RS4 Supplementary Tripod Jack Stand is designed to stabilize vehicles loaded on two-post surface and in-ground lifts. The lightweight stand has a capacity of 4,000 lbs and can be raised to a maximum height of 7'. To use the jack stand, technicians can pull the locking pin from the top of the stand, raise the column to a desired height and reinsert the pin. A screw-up adapter at the top of the column provides a fine-adjustment range of 5-1/2". The adapter has a rubber contact pad to ensure a secure connection. The RS4 Jack Stand complies with the ASME PALD-2009 safety standard for portable automotive lifting devices.