Features:-Aluminum alloy thickened base, with a strong desktop rotating clip, would be firmly fixed on the desktop.-With steel manage and M8 screw, smooth to operate.-The clamp bracket would be adjusted to slot horizontal deck rails or vertical posts and stair railings lower than 61mm thick.-A sponge pad is added to the base clip to stop scratches on the desktop.Specifications:*Product Name:Aluminum Alloy Bracket Clamp*Size:120*120*30 MM/4.72*4.72*1.18 InchMaterial: Aluminum AlloyColour blackItem: Bracket clampHole Diameter: 12MMRange: 1- 61MMColour:black Material: Aluminum AlloyPackage Content:1 x Aluminum Alloy Bracket ClampNote:1. The genuine colour of the item could also be slightly diverse from the pictures shown on online page caused by many factors corresponding to brightness of your computer screen and lightweight brightness.2. Please allow slight handbook size deviation for the data.