Solid brass mechanism. Rubber grommets on shackle and protective base for weather resistance. Key cover plate. Includes 3 steel keys. Horizontal x vertical shackle clearance: 196551: 19 x 21mm; 598493: 23 x 25mm. Shackle dia: 196551: 8mm, 598493: 11mm. Solid brass mechanism. Rubber grommets on shackle and protective base for weather resistance. Key cover plate. Includes 3 steel keys. Horizontal x vertical shackle clearance: 196551: 19 x 21mm; 598493: 23 x 25mm. Shackle dia: 196551: 8mm, 598493: 11mm.