The Powerbuilt Heavy Duty Screw Post Style Rolling Brake Seat is the perfect garage accessory for anyone who services or washes/waxes cars, trucks, motorcycles, bicycles and more. It's way overbuilt compared to the usual cheapo, tippy rolling seats, so it costs a little more. You get what you pay for, and here that means a stiff and solid frame welded from 1" diameter steel tubing and finished with a durable black powdercoat finish. The center post is threaded for fast easy height adjustment from 16" to 21". The 14" diameter seat is nicely padded and features a Powerbuilt logo on a thick vinyl cover. Maybe best of all is the rolling stock - four rubber casters that are 3 inches in diameter and 1" wide - just big enough and soft enough to roll over imperfections that stop wimpy casters in their tracks. Think of it as a long-term investment that will pay dividends for years to come.