Attach these casters to your favorite stand for the ultimate studio accessory. This set of casters is designed to fit all 22mm leg diameters. Brakes give extra security and keeps equipment safe. the 75mm wheels give smooth rolling to make moving your stands a cinch. Attachment: 22mm hole; color: gray; diameter: 2.95 in.; load capacity: 165.34 lbs.; weight: 3.75 lbs.