Astro Pneumatic 500lb Capacity Portable Work Stand 557003 Astro Pneumatic 500lb Capacity Portable Work Stand 557003 is a lightweight work bench with a heavy duty 500lbs capacity and is designed with a steel tubing construction with a 1/2” foam padded top. Astro Pneumatic 500lb Capacity Portable Work Stand 557003 is great for working on doors, fenders, hoods and bumpers.