Fotasy TRD Metal Tripod Collar Ring for Canon EF 100mm f/2.8L Macro IS USM lens (Black) Provide better balancing on a tripod Rotating the camera from horizontal to vertical orientation will be much easier and faster Flocked interior lining protects your lens from scratch Fits Canon EF 100mm f/2.8L Macro IS USM lens Replaces Canon Tripod Mount Ring D