This ball transfer unit is made of carbon steel. So it is robust and durable. The wheel can rotate 360 degrees, which works smoothly. It can be widely used in transportation, transmission system, power system, processing system, processing machinery and equipment Auxiliaries of wrapping machines. MATERIALS: The bale transfer unit is made of high quality carbon steel, durable and practical to use LOAD CAPACITY: 35 kg maximum load capacity per caster 360 DEGREE CASTER: The caster rotates 360 degrees, which greatly reduces the labor intensity of workers The transmission system, feeding system, processing system, processing machinery and packing machinery auxiliary equipment Specification: Bale diameter : 25.4mm Length of mounted base: 70mm Height of castor: 30mm Package included: 6 x Ball transfer bearings Colour: silver Remar that: Because measurements are taken by hand, the sizes shown may vary slightly. The color may vary slightly depending on your monitor settings.