Securely fix your mount to flat surfaces using one of our Rectangle Flat Hole Bases. Choose between a 2 hole or a 4 hole base. Both bases can be fixed to flat surfaces vertically, diagonally or horizontally. Each base uses the universal AMPs hole spacing standard and the holes will accept 10G or M5 countersunk fasteners. If using the 4 hole base, we recommend using all 4 hole screws for the strongest connection. A 10mm Spacers and x2 screws are supplied for connecting the spacer to a Quad Lock 360 HEAD or ARM. Please Note: Screws are not provided for mounting the base to your required surface 4 HOLE BASE 1 x Flat Rectangle 4 Hole Base1 x 10mm Spacers1 x M5x30 Screw (for connecting Spacer to Lever Head or 360 Arm)1 x M5x45 Screw (for connecting Spacer to Weatherproof Wireless Charging Head) 4 HOLE BASE 58mm (2.3") long x 50mm (2") wide x 14mm (0.55") high AMPS Hole Pitch: 38mm (1.5") x 30mm (1.2") Smartphone Mounting For An Active Lifestyle Quad Lock 360 allows customers to build a mount to suit their active lifestyle. With over 200 different combinations, customers are now able to configure the perfect mount for their specific application, such as boating, kayaking, aviation, music, and off road activities to name a few. OVER 200 CONFIGURATIONS Quad Lock 360 consists of a Base, an Arm (optional) and a Head. Users can also incorporate a Vibration Dampener if necessary or USB Charger if they want to charge their device and the Weatherproof Wireless Charging Head is not a suitable option. FULLY CUSTOMISABLE Each component is sold separately, allowing for full customization and selection of HEAD, ARM, BASE and ACCESSORY parts suitable for your chosen application. ONE CASE - MULTIPLE MOUNTS