With standard 1/4" threads, scale plate, and built-in bubble level, this clamp is convenient for use. The jaw opens from 37mm to 42mm, making it compatible with any Arca-style plate such as RRS, Wimberley, Jobu Design, Arca Swiss, Kirk, Markins, etc. Features: - Made of aluminum alloy for durability and strength - Standard 1/4" threads allow direct mounting to 1/4" threaded devices - Fast loading base with anti-slip lock function - Includes scale plate and built-in bubble level for ease of use - Jaw opening range from 37mm to 42mm, compatible with Arca-style quick release plates Specifications: - Material: Aluminum Alloy - Color: Black - Item Size: 7.8 x 5 x 2.0cm / 3.1 x 2 x 0.8in - Item Weight: 88g / 3.1oz - Package Size: 8 x 5 x 3cm / 3.1 x 2 x 1.2in - Package Weight: 91g / 3.2oz Package List: - 1 x Clamp for Quick Release Plate - 1 x 1/4" Screw