The SS500E is equipped with a positive clamping system complete with a safety support pin to assure safe, slip-free support of elevated equipment. Vertical tube assembly contains 1-1/2" and 1-3/8" tubing. Clutch mechanism includes a protective insert for scratch-free height adjustment. Legs are double braced and include heavy-duty rubber feet for extra stability. Heavy-duty aluminum speaker stand weighing 7 lbs. supports up to 150 lbs. Two Speaker Stands For One Low Price!.