Shop Total Lock Casters with Semi-Steel Wheels. These Total Locking Plate Casters come with double ball raceways for increased strength and maneuverability, cold-rolled heavy-duty gauge steel frame, and plated with a zinc finish for increased resistance to rust and corrosion. This is a high-quality caster made to last. The Top Plate we offer on this is an industry-standard 2-3/8" x 3-5/8" overall size. The Wheels are Gray Iron, also known as Semi-Steel wheels. They will not leave streaks but should only be used on clean, smooth concrete floors to prevent possible damage to other floors. The temperature range of Semi-Steel Wheels ranges from 600°F to -45°F and has a maximum weight capacity of 350 lbs per wheel when used in this total locking caster fork, depending on the size ordered. Steel wheels will not flat spot like softer wheels tend to do when sitting under heavy loads for long periods of time. The wheels have a solid one-piece design. These wheels are reliable, affordable, and fantastic, combined with this total locking swivel bracket, giving you a tremendous quality total locking caster meant for various applications and industries.