3/4″ diameter x 3/16″ deep. Brass body. Steel shackle. 3 Steel dials. Open: Set the 3 dials to the correct combination, then slide the lever on the reverse of the case down, and rotate the shackle. Close: Rotate the shackle until the lever snaps shut, then mix the combination. This is a miniature rendering of William Walker Patent # 221258. January 2013. Only 10 of these locks were made.