Jackshaft / Murray 424578Pack Size:1Murray 24578, Murray 424578, Murray 424578MAEdgewater 595625, ESF 192-303, Foley/Belsaw 5978270, Foley/PLP 192-303, Green Meadow JS971, Laser L2299, Laser 97495, NHC 253-6152, Oregon 85-005, Prime Line 7-04288, Quality 174010, Rotary 2937, Sunbelt SB-2937, Sunbelt B1SB2937Murray 25", 30" and 36" decks, 1978 and newerOD: 5/8 ", Length: 5 3/4 ", Thread: 1/2 "-20 UNF, #505 woodruff key seats