blades for lawnmowers mowers mowers lawnmowers MODELS: PRO CUT BLADE SYSTEM (12000) PRO CUT BLADE SYSTEM (12FT-3PL) PRO CUT BLADE SYSTEM (12FTGDW) PRO CUT BLADE SYSTEM (18000GR) PRO CUT BLADE SYSTEM (6000) PRO CUT BLADE SYSTEM (8000) (8FTGD) LENGTH: 313 mm Ø CENTRAL BORE: 30. 4 mm SIDE HOLE: 12.7 mm SIDE HOLE INDEX: 100 mm MAJOR CODE: 122-300 ORIGINAL CODE: NTSB12C CZ