You are purchasing (1) New Philmore 210 - DC Power Coaxial Plug 2.1mm x 5.5mm. 

Inline DC Barrel Power Plug. These plugs may also be called DC Coaxial plugs.

• Plug Size: 2.1mm 
• Center Pin: 5.5mm
• Outer Diameter: 5.5mm
• Length: about 1 inch
• weight: 0.05 ounce

RETURN POLICY: Before returning any item to us you must first call us to get a RMA. 90% of our returns are because the customer is unfamiliar with the product, which we can assist with. We can remedy most issues over the phone and or do a item replacement via phone without opening a return. If you return any item to us without RMA or trying to solve the issue with you, you will be charged an automatic restocking fee of up to 20%

•  ALL ITEMS ARE BEING SOLD BY RW ANTENNASTORE LOCKPORT, N.Y 14094 IN BUSINESS SINCE 1981