Add this set of 3 smooth rolling casters to your favorite light stand or boom stand for more mobility in the studio.the heavy duty foot activated brake lock on each wheel provides extra safety and keeps equipment safe. The 75mm wheels provide smooth rolling aroundmake moving your stands a breeze. The wheels are universal suitable for all light stand, especially suitable for Selens Light stand.Smooth rolling wheels make moving stands a snap.Locking wheels give safety and security to your equipment.suitable for the light stand which diameter less than 22mm.Colour:Black + SilverMaterial:PU+metalPackage Contents:3* CasterOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.