2 1/4 long 1 3/8 inside diameter gap 3/8 Comes with a total of 3 oval base rings. Two of them are 2" diameter and the other is 1 7/8 Ordering this would cost over $450 including the extra base rings, plus the 2 month wait. However MM devices are a perfect work of art! High quality, very comfortable, and easy returns for adjustments. USA shipping ONLY. Payment via paypal. $350 with free USPS Priority shipping
MM is excellent and fast with sizing adjustments. Can't say enough good about their products and customer service!
BUMP. $300 with free shipping in the USA via USPS priority and tracking #. Can mail within a day of paypal payment.