Oregon 198-086 PK3 Lawn Mower Blades Set of 3 blades 3 blades needed for 50" cut; Fits Z force deck, LT1050, RZT-50. Length: 17-7/8"; Width 2.5"; Thickness .149"; Center 6 point star 100 Series Blades formed with double bevel technology for extended cutting edge and reduced blade noise