Great for mounting those old brass barrel lenses, constructing a shutter box, or perhaps front mounting to a lens. No. 6 sync model with instant, bulb modes 6 X 6 INCHES Overall dimension, 3 1/4" Hole, flash sync Excellent working and cosmetic condition. Includes pin and screws, air fitting to go through lens board, bulb and tubing. Has cord cut off for going to flash cord. $100 incl. postage to USA. International shipping also available for additional fee. Paypal. Let me know if any questions.