Feature:1. Mechanical finish machining workmanship, surface frosted electroplating treatment, with glossy, harden black baking paint, not easy to scratch paint.2. Internal has protection pad, will not scratch lens body.3. Suitable for SIGMA four generation APO 70200mm F2.8 II EX DG lens.4. Lens fixed on tripod, can easily rotated in all directions to meet shooting needs.5. Made of high quality aluminium alloy material, sturdy, durable and long service life.Specification:Condition: 100% Brand NewItem Type: Lens Mount RingMaterial: Aluminium AlloyColor: BlackFitment: For SIGMA Four Generation APO 70-200mm F2.8 II EX DG LensQuantity: 1PCSInstall: Insert from Back of the Lens, Tighten ScrewsWeight: Approx. 157gInner Diameter: Approx. 67mm/2.64inchCircle Inner Diameter: Approx. 71mm/2.80inchCircle Width: Approx. 18mm/0.71inchCircle Thickness: Approx. 4mm/0.16inch.Package List:1 x Lens Mount RingNote:1. The surface of the lens foot frame ring made by baking varnish process. Please do not shoot it. It is not the reason for disputes.2. There is a slight error in manual measurement, based on pratice