“U.S.M.C.” – “No 8 T3034 MASTER…”. Body Type: Laminated. Body Material: Brass. Body Size: 1 3/16″Wx1 1/16″H. Shackle Material: Brass. Shackle Size: 7/32″Dx9/16″H. Model No: No. 8. Key Type: Single Sided 4 Pins.