Astro Pneumatic 500lb Capacity 557003 Portable Work Stand Astro Pneumatic 500lb Capacity 557003 Portable Work Stand 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 557003 Portable Work Stand is great for working on doors, fenders, hoods and bumpers.