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RAM-B-111-238U Features:

• Warranty: Manufacturer's, RAM Mounts (National Products Inc.), Limited Life Time Warranty.
• Material: Black powder coated marine grade aluminum with plastic twist knob and two 1 inch diameter rubber balls.
• NOTE: This marine grade aluminum plate can also be drilled into for a custom hole pattern without voiding the manufacturer's warranty.
• Mounting Plate Dimensions: 6.25 inches * 2 inches with 1.0 inch diameter "B" sized rubber ball. 
• Socket Ball Size: Connects to 1.0 inch B Ball Size / Max. Weight 5 lbs.
• Plate Description: RAM-B-111BU has many different combination of pre-drilled holes which will match many electronic devices including: CB Radios, Ham Radios, Marine GPS and other devices.  

   

• Base Plate Included: RAM-B-238U shown below is a marine grade aluminum universal diamond shaped plate with a 1.0 inch diameter "B" sized rubber ball. The plate has pre-drilled holes 1.9 inches from center hole to center hole.
  

    

• Arm Included: RAM-B-201U shown below is a standard length marine grade aluminum arm 2.875 inches in length from socket center to socket center and 3.6875 inches in overall length. A tightening knob on the side of the arm enables the sockets to clamp firmly to the attached base and mounting plate. The arm allows for easy adjustment by loosening the side knob, a single spring inside the arm opens the sockets, allowing the arm to pivot on the attached plates. This enables the arm and mounting plate to be positioned at various angles allowing the ultimate in position flexibility. Loosen the knob completely and the arm will disconnect from the accessories in seconds!