iShoot Lens Tripod Mount Ring for Nikon RT-1 Nikkor AF-S 300mm F/4E PF ED VR and 70-200mm F/4G ED VR -with Quick Release Plate Made of aviation aluminum materials, CNC precision machining, anodized surface, with stainless steel screw, light weight hollow out design, net weight is about 160g. Referring to and modified from Nikon original standard design, structure is enhanced, details are improved, and add the function of quick release plate, more practical. Tripod mount ring's inner diameter is about 68mm, using embedded flocking to increase contact surface; with three marks, convenient for lens rotation and alignment; fast spring lock, convenient for quick assembly and disassembly or adjust camera body for composition; removable quick release plate structure, reserved 1/4" and 3/8 " screw holes. 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 IS-JZ30 / IS-JZ50 / IS- JZ64 / IS-QJ58 / IS-QJ64 / IS-JZ60BK / IS-JZ70MFT / IS-JZ80BK Suitable for Nikon AF-S 300mm F/4E PF ED VR and AF-S 70-200mm F / 4G ED VR lenses