single intact and hard to find, very unique antique american depression-era original and intact two-tier rolling machine shop creeper likely designed and fabricated by the m. j. kerwer co., chicago, il. the nicely worn and weathered portable creeper contains a solid oak wood seat supported by two opposed wrought steel bent or curved straps the are bolted to both the seat and undershelf. the distinctive metal rollers or wheels are tightly secured to the underside of the bottom tier. each steel and/or iron wheel contains the words "swirl roller" embossed along the exterior. the factory machine shop creeper measures 14 x 16 x 12 inches.