1. This helmet fixed mount is made of qualified nylon and plastic, solid and firm, ensures a long service life. 2. Comes with a professional fixing screw, no other tools needed, easy to install and operate. 3. This adapter mount suitable for most kinds of helmet base. 4. Designed for Hero 1/ 2/ 3/ 4, suitable for YI and SJCAM too. 5. Great accessory for military activities, good quality with reasonable price, you will like it. Spec: 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