【Application】The 42 inch cutting blades are mainly used for Cub-Cadet/Craftsman/Troy Bilt/MTD 42 inch mower decks on riding lawn mowers, zero turn mowers, mulching mowers, lawn tractors, etc. 【Replacment Part Number】① 3-in-1 blades 742-0616, 742-0616A, 742-04308, 942-0616, 942-0616A, 942-0616-X, 942-04126-X, 942-04308, Toro 112-0315, Craftsman CMXGZAM110115. ② 2-in-1 blades 942-04312, 942-04312A 【Compatible Model】For ①Cub-Cadet LTX1040, LT1040, XT1-LT42, XT2-LX42, ZT1, RZT42, ②Troy-Bilt LTX2146, LTX1842, ③Craftsman T110, Z6000, LT1500, ④MTD RZT-42, RZT-42X, LT-542G, MTD Pro tractor. For more models, please check the product description 【Durable Blades】They are 3-in-1 blades with a 6-point star center hole for mulching, bagging, and side discharging purposes. The long and thick grasses can be cut into grass clippings because of their high-speed circulation 【Package Includes】4Pcs Mower blade with length 21-3/16", width 2-3/4", diameter of outside hole 5/16", center to center outside hole 2-1/2", thickness 5/32" Mulching Blades work for 42" Deck (but not limited to) Cad: lawn tractor: LTX1040, LTX1042 (2010, 2011), LT1040, LT1042 (2008 & after), LT1500, XT1-LT42, XT1-LT42C, XT1-LT42EFI, XT1-LT42KH, XT2-LX42, XT2-LX42 EFI, XT2-LX42 KH, XT2-LX42 KW; zero turn mower: RZT42, RZT-L42 KH, RZT-L42, RZT-S42, RZT-SX42 KH, ZT-1 42 KH. Troy Bilt: zero turn mower/tractor: 17BE2ACG011, 17AA5ABP766; TB1942, TB2142, TB42 Hydro, Colt XP, Mustang XP 42, Range Rider RZT 42, Mustang Z42, Mustang 42, LTX-1842 13AP609G063 (2003), LTX-2146, 13CX609G063, 13BX60KH011, 13AX609G063, 13UV609H063, 13AQ609G063; Troy Bilt Bronco: 13AV60KG011, 13AO77TG766; Troy Bilt Super Bronco: 13AX60KH011, 13BX60TG766, 13AT609G766; Troy Bilt Pony: 13AN77KG011, 13AN77TG766. Craftsman: PYT9000, T105, T110, T130, T210, T1000, T1100, T1200, T1300, T1400, T1800, T2100, T3000, T7800, T8000, LT1500, LT2000, Z6000, ZTL7000. MTD: RZT-42, RZT-42X, 13AG611G706K, 13AG618G705, 13AN772G000, 13AD685G000, etc. Yard Machines: 13A7660G752, 13AJ690G752, 13AM660F000, 17AA5AAG700, 13BK608G062, etc. Roybi: 13AD678G034, 13AN688G034. Bolens: 13AG683G163, 13AN683G163, 13AO683G163, 13AM662G765, 13AM662F765. NOTE: Please refer to your product manual to see if your model will fit on. Replacement part number: ① 3-in-1 blades 742-0616, 742-0616A, 742-04308, 942-0616, 942-0616A, 942-0616-X, 942-04126-X, 942-04308, Toro 112-0315, Craftsman CMXGZAM110115. ② 2-in-1 blades (except for mulching function) 942-04312, 942-04312A. The 4 pieces of the blade each come with a 6-point star center hole for installing on the deck spindles. Material: Metal. Size: Length 21-3/16", width 2-3/4", diameter of outside hole 5/16", center to center outside hole 2-1/2", thickness 3/20".