1. Using high-density aviation aluminum, automatic CNC machine tools, diamond multi-tool heads, hollow carving precision 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. Don't - there should be no stickers 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 point the point, 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 polished, 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/ARCA-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 shooting, when shooting vertically, loosen the knob to rotate the lens; this product is suitable for Canon RF 100mm F2.8L Macro IS USM; Applicable lenses: For Canon RF 100mm F2.8L Macro IS USM Colour: Black Material: aluminum alloy Package Contents: 1 x Tripod Mount Ring Only 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.