Tripod Mount Ring, All Metal Lens Collar Support Bracket for Sigma MC-11 Mount Converter Lens Adapter of Canon EF-E Mount, Diameter 61.5mm Lens Holder with Arca Swiss fit Quick Release Plate Main features: 1. Made of aviation aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized finish, with stainless steel screw; 2. Customized according to Sigma MC-11 Mount Converter. Positioning by the switch and bayonet. Cannot be rotated. All the corners are rounded. The inside is covered with 3M plastic film to prevent lens wear; 3. Inner diameter is about 61.5mm, width is about 20mm; bottom is added quick release plate feature, plate length is about 70mm, with 1/4 and 3/8 screw holes and stainless steel anti-slip screw, net weight is about 165g; 4. Bottom quick release plate is AS standard, compatible with RRS / ARCA-SWISS / PMG / WIMBERLEY / MARKINS / PHOTOCLAM / SUNWAYFOTO / BENRO / SIRUI/MARSACE / ISHOOT tripod ball head, suitable for IS-JZ30 / IS-JZ50 / IS-JZ64 / IS-QJ58 / IS-QJ64-FD / IS-JZ60BK / IS-JZ70MFT / IS-JZ80BK clamp. Suitable for: Sigma MC-11 Lens Adapter of Canon EF-E Mount (Notice?This ring can only be used with Canon EF-E mount, can't be used with Sigma SA-E and other mount.) Package Includes: 1 x iShoot Tripod Mount Ring IS-MC11 for Sigma MC-11 Lens Adapter of Canon EF-E Mount (Note: The other items in the photos not listed here are for illustrating only, not included)