MULCHING BLADE FOR MOWER MOWER MTD YARD MAN GUTBORD FOR MODELS 18/117 MODEL - TECHNICAL SPECIFICATIONS LENGTH 413 mm CENTRAL BORE STAR 6 PINS OUTSIDE BORE 7.9 mm CENTRAL BORE INDEX 63.5 mm CODE: 13270316 ORIGINAL CODE 742-0542 , 942-0542 , 742-0542s SR