Features: This helmet fixed mount is made of qualified nylon and plastic, solid and firm, ensures a long service life. Comes with a professional fixing screw, no other tools needed, easy to install and operate. This adapter mount suitable for most kinds of helmet base. Designed for Hero 1/ 2/ 3/ 4, suitable for YI and SJCAM too. Great accessory for military activities, good quality with reasonable price, you will like it. Specifications: Condition: 100% Brand New and High Quality Material: Nylon & Plastic Color: Black Rotation: 90 Size: Approx. 5 x 5 x 3.5cm / 2.0 x 2.0 x 1.3inch Suitable for FAST / AF Helmet Base, for M88 / MICH Helmet Base Suitable for Hero 1/2/3/4, for SJCAM, for YI Camera etc Weight: Approx. 35g Packing List: 1 x Helmet Mount Adapter 1 x Fixing Screw .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1This helmet fixed mount is made of qualified nylon and plastic, solid and firm, ensures a long service life. 2Comes with a professional fixing screw, no other tools needed, easy to install and operate. 3This adapter mount suitable for most kinds of helmet base. 4Designed for Hero 1/ 2/ 3/ 4, suitable for YI and SJCAM too. 5Great accessory for military activities, good quality with reasonable price, you will like it.