iShoot Lens Collar Replacement Foot Tripod Mount Ring Base IS-MC21 Compatible with Sigma MC-21 EF-L Mount Converter Lens Adapter Bottom is Arca Fit Quick Release Plate Feature for RRS / Arca-Swiss Fit Ballhead Clamp Main Features: 1. The lens collar replacement foot is made of high-density Aviation Aluminum, lightweight and solid; precisely machined by world-class high-end CNC turning center; hollowed-out work processed by Multi-Diamond Cutter finely; 2. The Tripod mount ring base surface using vibration polishing technology and multiple anodic oxidation, greatly increased the color uniformity of the metal surface; the appearance and exquisite workmanship is much better than similar products made by mold; 3. The lens collar foot is tailor made for Sigma MC-21 EF-L Mount Converter Lens Adapter, volume is about 32 x 39 x 36mm, net weight is about 65g; the locking screw has a built-in spring; 4. The bottom quick release plate of the replacement foot is about 36mm in length, adopts ARCA-SWISS / RRS 39mm standard fit, and reserved 1/4 and 3/8 screw holes, equipped with stainless steel non-slip screws? 5. This lens support bottom is added Quick Release Plate feature of 39mm Arca-Swiss fit, compatible with RRS / ARCA-SWISS / PMG / WIMBERLEY / MARKINS / PHOTOCLAM / SUNWAYFOTO / BENRO / SIRUI / MARSACE / ISHOOT ball head of Arca 39mm fit, suitable for iShoot IS-JZ30 / IS-JZ50 / IS-JZ64 / IS-QJ58 / IS-QJ64-FD / IS-JZ60BK / IS-JZ70MFT / IS-JZ80BK. Compatible with: Sigma MC-21 EF-L Mount Converter Lens Adapter for Canon EF Mount Lenses to Panasonic Lumix L Mount Cameras Package Includes: 1 x iShoot Lens Collar Foot IS-MC21 for Sigma MC-21 EF-L Mount Converter (Note: The other items in the photos not listed here are for illustrating only, not included)