Lorell Stacking Chair with Plastic Arm, 20-3/4 by 20-3/8 by 35-5/8-Inch, Black, Set of 4 Sturdy, 7/8" tubular steel frame on each chair holds up to 250 lb Chairs stack up to eight high Stacking chairs with plastic arm caps feature padded vinyl on the seats and square backs Sturdy, 7/8-inch tubular steel frame on each chair holds up to 250 lb. Chairs stack up to eight high Stacking chairs with plastic arm caps feature padded vinyl on the seats and square backs Sturdy, 7/8" tubular steel frame on each chair holds up to 250 lb.