Feature: 1. Suitable for Sigma AF 150-500mm f5-6.3 APO DG OS HSM lens. 2. Made of aviation aluminum, CNC precisely machined, surface anodic oxidation, built-in anti-slip patch, copper core knob, stainless steel anti-slip nail. 3. The inner diameter is about 85.5mm, the width is about 18mm, the bottom is equipped with quick release plate, the length quick release plate is about 97.5mm, 1/4 in and 3/8 in screw holes are reserved 4. The quick release plate adopts AS standard, compatible for RRS/ ARCA-SWISS/ KIRK/ WIMBERLEY/ MARKINS/ SUNWAYFOTO/ KANGRINPOCHE/ BENRO/ SIRUI/ MARSACCE/ ISHOOT and other standard platforms. It is suitable for IS-JZ30/ IS-JZ50/ IS-JZ64/ IS-QJJ64/ IS-QJJ64/ IS-JJJJJJJ64/ IS-JZ60BK/ IS-JZJ80BK etc. 5. Scope of application includes, for AF APO 50-500mm F4.5-6.3 DG OS HSM; for AF APO 120-300mm F2.8 DG OS HSM; for AF APO 120-400mm F4.5-5.6 DG OS HSM; for AF APO 150-500mm F5-6.3 DG OS HSM. Specification: Item type: Lens Tripod Mount RingCondition: 100% brand newMaterial: aluminium alloyWeight: Approx. 304gColor: blackRing inner diameter: Approx. 85.5mm/3.4inRing width: Approx.18mm/0.7inQuick release plate: Approx. 97.5mm/3.8inScope of application: For AF APO 50-500mm F4.5-6.3 DG OS HSM; For AF APO 120-300mm F2.8 DG OS HSM; For AF APO 120-400mm F4.5-5.6 DG OS HSM; For AF APO 150-500mm F5-6.3 DG OS HSM. . Package List: 1 x Lens Tripod Mount Ring1 x Inner hex wrench