Knife blade for lawn mowers, lawn-trimmer mowers FLYMO FOR CHEVRON 34 MODELS - TECHNICAL SPECIFICATIONS LENGTH 340 mm CENTRAL BORE 8.3 mm OUTER BORE 8.3 mm CENTRAL BORE INDEX 60 mm CODE: 13271780 ORIGINAL CODE: 575 58 30-01 , 575583001 , 577 36 64-90 , 577366490 SR