It adopts high-density aviation aluminum, automatic CNC machine tools, diamond composite cutter heads, and precision machining of hollow engraving. Vibration polishing technology is adopted, which improves the precision by 20% compared with manual polishing, and multiple anodizing, so that the color uniformity of the metal surface is increased by 10%. There is a plastic film on the inner wall of the tripod ring bracket installation card to protect the lens and rotate freely. Each focusing point is laser-engraved, the locking knob is anti-slip design, and the knob is not removable. The bottom plate adopts Arca SWISS/RRS structure quick release plate, about 75mm in length, with 1/4 and 3/8 screw holes, stainless steel non-slip screws are detachable. Compatible with Sigma 150-600mm F5-6.3 DG OS HSM C. Type: Lens tripod ring Model: IS-SM1560C Applicable models: For Sigma 150-600mm F5-6.3 DG OS HSM C Features: Camera Lens Adapter color:Black Material:Metal Package Contents: 1 x Lens Ring Bracket Only the above package content, other products are not included. Note: Light reflection 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.