1. Nonslip and shockproof: The TPUcoated M8 ball head features an ergonomic design, ensuring a fit with the double base arm. The connection remains firm and resistant to loosening. The soft, flexible ball head foot effectively absorbs strong bumps while cycling. The 360° rotatable ball head allows adjustment of the phone holder in horizontal or vertical directions, providing an ultrastable and driving view. 2. RAM mount compatibility: The 1inch ball head adapter with M8 x 1.25 bolts is compatible with RAM mounts (Bsize double base arm) and motorcycle/bicycle phone holders. It supports any phone holder accessories with a 1inch ball head mounting system. The 1inch ball base fits M8 motorcycle rearview mirrors, electric vehicles, offroad vehicles, and other devices with a 1.25 mm thread pitch. 3. Installation dimensions: The M8 ball head consists of a 1inch TPU Btype ball head and an M8 x 1.25 threaded post. The ball head diameter is 25 mm, and the M8 x 1.25 steel post's external thread connects to standard internal threads on digital cameras, camcorders, and other devices. For installation, threaded holes must meet the following specifications: M8 x 1.25 pitch. 4. Durable and longlasting: The 1inch ball head adapter's M8 x 1.25 threaded body is crafted from stainless steel and precisionmachined via CNC. The sturdy stainless steel ball head is coated with quality nonslip rubber for enhanced protection. It withstands heavy weight and pressure, making it ideal for kayak phone holders, scooter phone holders, pram phone holders, and other mounting bases. A reliable choice for longterm use.