Instant purchase ○ Model Number: 2EM S.D. Stefan Dohr Model Inner Diameter: 17.5mm Throat Diameter: 4.2mm Cup Shape: U cup Shank: JK has its own unique shank that fits both American and European models. Purchased 3 months ago for 17,000 yen. No returns/no cancellations. The original box from the purchase is included.