For the past 100 years, we've earned a reputation for building the industry's most durable casters and wheels. We back it up with a three-year warranty that shields nearly our entire line. Chances are, you'll never need it. But you'll appreciate the peace of mind. The Economic" kingpin less caster featured an unconventional upper raceway for added vertical load handling. or the "Miracle Wheel." An aerospace favorite that helped build the booster for NASA's Saturn V moon rocket. Hamilton Precision Integrated (HPI) swivel technology proves its mettle in heavy, 24/7 applications, outlasting standard raceways. Spinfinity no-maintenance kingpin less casters curb downtime.