Main Features:1. The tripod mount ring is tailor-made for Canon EF 100mm f/2.8L Macro IS USM Lens; Can't be used with Canon EF 100mm f/2.8 USM Macro Lens. Adopt original factory standard, split structure. It is redesigned and produced by use new material and technology based the old version tripod ring TMR;2. The inner diameter of this tripod ring is about 68mm. The surface contacting the lens is affixed with thicken flocking, the width of this contact surface is 18mm; net weight is about 142g;3. The tripod collar bottom is added 55mm long Arca fit quick release plate feature, can be used with 39mm Arca-swiss fit tripod ball head, panoramic head and clamp directly; more practical than lens collars without QR-Plate; also reserved 1/4" screw holes and stainless-steel anti-slip screw for fixing lens to tripod directly;4. The tripod collar mount ring is made of high quality Aviation Aluminum, lightweight and solid; precisely machined by world-class high-end CNC turning center, surface anodic oxidation; appearance and exquisite workmanship is much better than its old version and the similar products made by mold;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: Canon EF 100mm f/2.8L IS USM Macro Lens (Note: Can't be used with Canon EF 100mm f/2.8 USM Macro Lens)Package Includes: 1 x iShoot Tripod Mount Ring IS-C100L Compatible with Canon EF 100mm f/2.8L Macro IS USM Lens