Tripod Mount Ring All-Metal Lens Collar for Canon EF 28-300mm f/3.5-5.6L IS USM and EF 70-300mm f/4-5.6L IS USM, Built-in Arca-Swiss Quick Release Plate with 1/4 and 3/8 Screw Hole for Tripod Ball Head Main Features: 1. The lens support is referencing to and modified from Canon original standard design, bearing is enhanced, details are improved, and added the features of quick release plate, more practical; 2. The lens collar is made of Aviation Aluminum, CNC precisely machined, surface anodic oxidation; split structure, built-in anti-skid patch, copper knob, stainless steel anti-skid nails; 3. The weight of the tripod mount ring is about 165g, inner diameter is about 80mm, ring width is about18mm; bottom quick release plate is about 76mm long, with 1/4" and 3/8" screw holes; 4. Quick release plate is AS 39mm standard, compatible with RRS / ARCA-SWISS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / SIRUI / MARSACE / ISHOOT ball head of Arca 39mm fit, suitable for iShoot IS-JZ30 / IS-JZ50 / IS-JZ64 / IS-QJ58 / IS-QJ64 / IS-QJ64-FD / IS-JZ60BK / IS-JZ70MFT / IS-JZ80BK. Applicable to: Canon EF 28-300mm f/3.5-5.6L IS USM Lens Canon EF 70-300mm f/4-5.6L IS USM Lens Package Includes: 1 x iShoot Tripod Mount Ring IS-C730PB (The other items in the photos not listed here are for illustrating only, not included)