These casters make moving heavy industrial items a breeze .They are well-constructed and provide smooth swiveling for easy maneuverability. Based on my observations, they have a robust threaded stem that ensures a secure fit and a threaded capacity that can withstand rugged conditions. The only downside is that they are a bit pricey compared to other brands but you definitely get what you pay for. Overall, I recommend these casters to anyone looking for reliable and durable mobility solutions in Material Handling Products. Keywords: Industrial and Scientific..