ITEM NAME:QR-50 Aluminium Quick Release Plate QR Clamp with Gradienter Fits Arca Swiss RRS Description: All-metal materials, CNC precision machining, surface oxidation treatment Built-in spirit level and precision ruler With the female thread of UNC 3/8" standard, the width of the dovetail groove in the bottom is about 20mm Compatible With: All Arca-Swiss standard quick release plates, including Benro / Arca Swiss / / Kirk / Wimberley / Gitzo / Manfrotto and etc. A great photography accessory for panoramic photography and close-up photography Specification: Material: alloy Size: 50mm Package Includes: 1Piece Quick Release Clamp SKU: CKX0012844977000948.Compatible With: All Arca-Swiss standard quick release plates, including Benro / Arca Swiss / / Kirk / Wimberley / Gitzo / Manfrotto and etc. 1Piece Quick Release Clamp. Size: 50mm. With the female thread of UNC 3/8" standard, the width of the dovetail groove in the bottom is about 20mm.