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 of manual polishing, and multiple can the color and uniformity of the metal surface by 10% ;2. According to the shape and structure of the S 70-300 F4.5-5.6 Macro OIS lens, retain the switch function, install to the lens bayonet, no on the installation part, only horizontal after installation, not vertical , The tripod ring cannot be rotated;3. The corners of the tripod ring are , and the inner wall is made of plastic film; the minimum inner diameter is about 74.5mm, and the width is about 22.5mm. and 3/8 screw holes, removable stainless steel anti-slip screws4. The tripod ring mounting ring is made of high-quality aviation aluminum, which is light and strong; the surface is anodized; the appearance and workmanship are exquisite, superior to the old version and similar products made by molds;5. Unique design, can better your camera.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.