iShoot CNC Machined 81mm Tripod Mount Ring Lens Collar for Sony 70-400mm f/4-5.6 G SSM Lens and Sony 70-400mm f/4-5.6 G SSM II Lens SAL70400G2, Built-in Arca Swiss Type Quick Release Plate Main Features:1. The tripod mount ring is made of aviation aluminum, CNC precisely machined, hollow-out weight reduction design, polished and surface anodized, with stainless steel screw; net weight is about 145g;2. Referencing to and modified from Sony original standard design, bearing is enhanced, details are improved, and added the features of finger position and quick release plate, more practical;3. The diameter of the lens support is about 81mm, the use of embedded PP material inside the lens bracket to increase the damping; accurate bayonet, same to the original one, easy to quickly disassemble and adjust the body composition; tripod ring comes with quick release plate structure, 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-JZ60BK / IS-JZ70MFT / IS-JZ80BK.Applicable to: Sony 70-400mm f/4-5.6 G SSM (SAL70400G) Sony 70-400mm f/4-5.6 G SSM II (SAL70400G2)Package Includes: 1 x iShoot Tripod Mount Ring IS-S740 (The other items in the photos not listed here are for illustrating only, not included)