Lens Collar Foot Tripod Mount Ring Stand Base for Canon EF 100-400mm f/4.5-5.6L IS II USM Bottom is Camera Quick Release Plate Compatible with Ball Head of Arca-Swiss Standard Interface Made of Aviation Aluminum CNC precisely machined, hand-polished, anodized surface with non-slip rubber and 1/4" stainless steel screw and spring Referring to the original structure design, added the features of finger position and quick release plate, the volume is about 82mm x 38.5mm x 30mm, net weight is about 100g Replaces the original tripod mount base of Canon EF 100-400mm f / 4.5-5.6L IS II USM lens, bottom is quick release plate of Arca-Swiss standard interface, compatible with RRS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / SIRUI / MARSACE ball head, suitable for IS-JZ30 / IS-JZ50 / IS-JZ64 / IS-QJ58 / IS-QJ64 / IS-JZ60BK / IS-70BK / IS-JZ80BK, etc Package includes:1 x Lens Tripod Mount Ring Base IS-THDZ(Note: The other items in the photos not listed here are for illustrating only, not included)