1. Using high-density aviation aluminum, automatic machine , diamond multi-tool heads, hollow carving machining; using vibration polishing technology, the accuracy is 20% higher than manual grinding; using multiple anodization, the metal surface hardness and uniformity are improved by 20% %;2. 't - there should be no on the mounting part of the lens. If there are, they should be removed, otherwise they cannot be installed; first install the plastic ring, when installing, please carefully the , otherwise the plastic ring may be offset; after installing the plastic ring, install the metal tripod ring;3. The tripod ring adopts a split structure, the edges and corners are , and the inner wall is affixed with a plastic film; the locking knob has a non-slip design, and the knob is released and pulled out to unlock;4. The bottom of the tripod ring adopts the RRS/-SWISS structure quick release plate, the plate length is about 70mm, and there are 1/4 and 3/8 screw holes on the plate to expand the external quick release plate or tripod. disassemble,5. Supports horizontal and vertical , when vertically, loosen the knob to rotate the lens; this product is suitable for RF 100mm F2.8L Macro IS ;Applicable lenses:For RF 100mm F2.8L Macro IS Colour: BlackMaterial: aluminum alloyPackage Contents:1 x Tripod Mount RingOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.