COMPATIBILITY: ONLY compatible with NEEWER Photography C Stand. Note: NOT for the NEEWRE SC320Q C Stand SOLID CONSTRUCTION: Made of metal and rubber with heavy-duty construction, this swivel caster set is durable and solid enough; Diameter: 75mm SWIVEL MOTION: Easy to install and have plenty of swivel motion, 360-Degree Rotation, Flexible sliding and heavy Bearing SECURITY: With step lock system to lock and release the wheels, its step on lock can make sure the security when using this wheels set; Its rubber base is perfect for its non-slip design NOTE: C Light Stand is not included