“U.S.M.C. SLAYMAKER” – “PAT. No 1837071…”. Body Type: Laminated. Body Material: Steel. Body Size: 1 3/4″Wx1 1/2″H. Shackle Material: Steel. Shackle Size: 9/32″Dx7/8″H. Model No: ?. Key Type: Single Sided 4 Pins.