The most secure universal holder on the market. Dual screw clamping to quickly and securely hold device. Integrated rubber pads for no slip. Large Device Holder measures 3-5/8" to 6" wide. Standard Device Holder measures 1-5/8" to 3-5/8" wide (perfect for iPhone). Note: Requires Kuryakyn's accessory mount for installation (sold separately). Note: Kuryakyn part number: 1693.