BLADE KNIFE FOR ROTARY MOWER ROTARY MOWER FLYMO FOR MODELS CHEVRON420 , RE420 , VENTURER TURBO 4 MODEL - TECHNICAL SPECIFICATIONS LENGTH 420 mm CENTRAL BORE 15.9 mm EXTERNAL BORE - mm INDEX OF CENTRAL HOLES - mm CODE: 13286970 ORIGINAL CODE: 511 92 23-10 , 511922310 , 531 00 50-38 , 531005038 SR