(2) PACK SCREW DOWN CIRCLE SCREW IN SPEAKER JACK THESE ARE HIGH QUALITY JACKS WITH AIR TIGHT SEALS AND NICKEL PLATED TERMINALS INNER MEASUREMENT ----- 3 INCHES OUTER MEASUREMENT ----- 4 INCHES THIS IS FOR A (2) PCS SCREW DOWN CIRCLE SCREW IN SPEAKER JACK THESE ARE HIGH QUALITY JACKS WITH AIR TIGHT SEALS AND NICKEL PLATED TERMINALS INNER MEASUREMENT ----- 3 INCHES OUTER MEASUREMENT ----- 4 INCHES DONT FORGET YOUR CUSTOM MDF RINGS FOR YOUR BOX WE HAVE EVERY TERMINAL/CONNECTOR THAT YOU COULD WANT IN OUR EBAY STORE UNINSULATED COPPER VINYL NYLON BULLET BUTT RING SPADE T TAPS SCOTCH LOCKS CLOSE END CAPS WIRE NUTS ETC.