“U.S. N.P.S.” – “BEST”. Body Type: Extruded. Body Material: Brass. Body Size: 1 1/2″Wx1 19/32″H. Shackle Material: Steel. Shackle Size: 5/16″Dx1 1/4″H. Key Type: Single Sided 6 Pins. Made for” US Nation Parks Servece.