Features: Upgraded IS-RF100 lens collar support is specially designed for RF 100mm f/2.8L Macro IS USM lens.Support horizontal and vertical shooting, when shooting vertically, loosen the knob to rotate the lens, convenient to use. Made of aviation aluminum material, precision CNC machining, lightweight hollow design, polished and anodized finish on the surface, durable for long service life. Tripod mounting ring adopts a split structure, the edges and corners are polished, and the inner wall is pasted with a plastic film which will not worn the lens. Plate length is about 70mm, built-in camera quick release plate for tripod for head, equipped with 1/4" and 3/8" screw holes. Bottom is 39mm standard RRS interface quick release plate, for RRS/ARCA-SWISS tripod ballhead, pan for head and clamp. Specifications: Material: Aluminum Alloy+PC Color: Black Plate Length: about 70mm/2.75", with 1/4" and 3/8" screw holes Applicable Model: for RF 100mm f/2.8L Macro IS USM Lens Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Piece Lens Tripod Mount Ring Base