Features: brand new and high quality 1. Made of aviation aluminum, CNC precisely machined, lightweight hollow-out design, surface grinded, polished, and anodized; 2. The volume is about 75 x 50 x 15mm, net weight is about 35g, and inner diameter is about 39mm; 3. After testing, for RRS / Arca-Swiss standard quick release plate of less than 39mm (including 38mm), converted to be used for Manfrotto, Gitzo and other brands' Fluid for Head , Gear for Head, Three-dimensional (3D) for Head , or Ball for Head using 50mm standard quick release plate; 4. Compatible quick release plate including RRS / PHOTOCLAM / GITZO (ARCA-SWISS standard) / MANFROTTO (ARCA-SWISS standard) / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / MARSACE / ISHOOT; 5. Compatible tripod for head / clamp including Manfrotto MVH500 and MVH700 series fluid for head, 500/for 501/577/701 wide clamp of 50mm inner diameter; Gitzo G series, for GH series, 1780/1781/2780/2781 tripod for head using wide clamp of 50mm inner diameter. Package Includes: 1 x iShoot Quick Release Plate Clamp Adapter IS-3950PRO Specifications: Item: Quick Release Plate Clamp Adapter Material: Aluminum Alloy Model: IS-3950PRO Color: Black Size: about 75 x 50 x 15mm/2.95x1.97x0.59in for: for RRS / Arca-Swiss standard quick release plate of less than 39mm (including 38mm), note: The product can'for t lock the quick release plate, please try to be horizontal when installing or removing the quick release plate in for case of camera falling off. The other items in the photos not listed here are for illustrating only, not included. Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. The error of manual measurement of the size is within the normal range of 0-2cm.