The tripod mount ring mount on the tripod, it helps you fix and balance your tele lens which is heavy or long lens hanging off the front of camera.<br/><br/> Ring SPECIFICATIONS:<br/> Ring inner diameter: 67mm<br/> Ring width: 17.8mm <br/> Ring thickness: 6.1mm<br/> Color: Black<br/> The UNC (Unified National Coarse Thread) is 1/4" and 3/8"<br/> Advanced CNC processing, High quality aluminum<br/> baking painted surface<br/> Perfect conformity in color and surface qualities<br/><br/> Quick Release Plate SPECIFICATIONS:<br/> Length: 60mm<br/> Width: bottom 38mm, top 40mm<br/> Plate thickness: 10mm<br/> Color: Black<br/> The UNC (Unified National Coarse ) Thread is 1/4" and 3/8"<br/> Advanced CNC processing,High quality Anodized aluminum alloy<br/><br/> Replacement of Nikon RT-1<br/> Suitable for: <br/> Nikon AF-S NIKKOR 70-200mm f/4G ED VR lens<br/> Nikon AF-S NIKKOR 300mm f/4E PF ED VR<br/><br/> Item Included:<br/> Lens Tripod Mount Ring x 1<br/> Tripod Quick Release Plate x 1<br/> M4 SOCKET HEAD Cap Screws SHCS X2<br/> Allen wrench x1