What are the dimensions and features of the seat on the NPS 6424B stool?

The seat is 14" in diameter and has 0.5" vinyl padding riveted through the steel seat pan.

What is the weight capacity of the NPS 6424B stool?

The NPS 6424B stool supports up to 500 lb.

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NPS 6424B 6400 Series Heavy Duty Vinyl Padded Steel Stool With Backrest - Supports Up to 500 lb - 24" Seat Height - Gray Seat, Gray Base

Sturdy 0.88" O.D. 18-gauge steel tubing with fixed legs.
Seat is 14" diameter with an 11.5" diameter, 0.5" vinyl padding riveted through the steel seat pan.
Foot rings with 0.63" O.D. are welded to each leg by four contact points for added rigidity.
Features vinyl padded backrest that is 6" h x 12" w and adjusts up/down and forward/back.
4.75 mm MDF board, with rivet heads fully embedded.