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