Feature: Made of 45# steel, sturdy and It can be used for industrial machinery, trolleys, It can not work The load capacity of each caster is 200kg The inner packaging of each product has a unique production order number label to prove its conformity, including the order number, model and inspection date information; If you have any questions about the project, please provide the production order number so that we can check it, and your profit will be guaranteed. Note: The four-wheel load capacity can only be the sum of the three-wheel bearing at the time of purchase, because the four-wheel load cannot appear because the fire was not fired. Product Parameters:Material: 45# SteelColor: YellowTotal Length: 40mm/1.56inchWheel Diameter: 31mm/1.22"Bracket Thickness: 2mm/0.08"Bracket Size: 56x31mm/2.20x1.22"Installation Skills: 42x18mm/1.65x0.71"Mounting Hole Diameter: 6.2mm/0.24"Shaft Diameter: 6mm/0.24"Slot Width: 17mm/0.67inchGroove Depth: 8mm/0.31" Overall Size: 56.2x44x40.4mm/2.21x1.73x1.59" (Length x Width x Height)Detection Capacity Per Round: 441LbsWeight: 142g Overall List:1*Grooved Ring WheelNotes:1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the picture on website.2. Please allow slight deviation between the data and manual measurement.