ARKON SP142025MM Camera Bolt Tripod 1/4-Inch 20 to 25 mm Swivel Ball Adapter (Black)The SP142025MM adapter allows you to convert your 1/4”-20 compatible tripod or monopod into a heavy-duty 25mm smartphone or tablet mount. This adapter is compatible with all tripods and monopods utilizing the 1/4”-20 screw pattern. (Mounts, holders, and devices sold separately.) Screw the adapter onto the tripod, mount the Robust Mount shaft onto the 25mm ball, then mount the device. Use the SP142025MM adapter with any current ARKON Robust Mount models by removing the mount base: RM080AMPS Heavy-Duty 80mm Suction Mounting Pedestal with 4-Hole AMPS Head, RM2XAMPS Heavy-Duty 4-Hole AMPS to 4-Hole AMPS Mounting Pedestal, RM0802T Heavy-Duty 80mm Suction Pedestal, RM0801420 Heavy-Duty Camera Suction Mount, RMAMPS1420 Heavy-Duty 4-Hole AMPS Wall Mount for Cameras, RMAMPS2T Heavy-Duty 4-Hole AMPS Mounting Pedestal with Dual-T Head, RM0861420 Heavy-Duty C-Clamp Mounting Pedestal with 1/4”-20 Camera Head, and RM0862T Heavy-Duty C-Clamp Mounting Pedestal with Dual-T Head. This adapter can also be used to work with RAM Mounts or other mounts utilizing the 25mm ball pattern.ARKON 25mm Ball to 17mm Ball Adapter - Black - SP25MM17SP25MM17 is a versatile adapter that allows you to convert mounts with a 25mm (1 inch) mounting pattern (including Arkon Robust Mount models and RAM Mounts—sold separately) to a 17mm mounting pattern. This includes only the 25mm Ball to 17mm Ball Adapter. (Mounts, holders, and devices sold separately.) Secure the adapter onto any mount accommodating the 25mm (1 inch) ball pattern. Use the SP25MM17 adapter with current Arkon Robust Mount Models including RM080AMPS (Heavy-Duty 80mm Suction Mounting Pedestal with 4-Hole AMPS Head), RM2XAMPS (Heavy-Duty 4-Hole AMPS to 4-Hole AMPS Mounting Pedestal), or RM0802T (Heavy-Duty 80mm Suction Pedestal) to make them compatible for Garmin GPS or other devices with a 17mm mounting pattern.