Solid brass. Vinyl covers protect the lock body as well as surrounding surfaces. Lock body is constructed of covered aluminum for improved corrosion-resistance. Hardened steel shackles protect against sawing and cutting. No. 121T: 3/4'' wide; 3-pin tumbler, solid black covered body with standard steel shackle, 2 pack keyed alike A: 5/32'', B: 7/16'', C: 1/4'' No. 131D: 1-3/16'' wide, 3/16'' shackle diameter, clearance: 5/8'' vertical and 9/16'' horizontal, black No. 131Q: 4 pack, black, 1-3/16'' wide, 3/16'' shackle diameter, clearance: 5/8'' vertical, 9/16'' horizontal No. 131T: 1-3/16'' wide, A: 3/16'', B: 5/8'', C: 9/16'', black, 2 pack keyed alike, black cover No. 141D: 1-9/16'' wide, 1/4'' shackle diameter, clearance: 13/16'' vertical and 13/16'' horizontal, black No. 141T: 2 pack, black, 1-9/16'' wide, clearance: 13/16'' vertical, 13/16'' horizontal