Mulching Blade / Murray 456251MAPack Size:1Murray 456251, Murray 56251E701, Murray 456251MA, Murray 56251E701MALaser 91382, NHC MU2616, Oregon 97-004, Prime Line 7-06415, Rotary 6145, Sunbelt MU-2616, Sunbelt SB-6145, Sunbelt B1MU2616, Sunbelt B1PD2001Murray 40" deck mowers equipped with model 24755 mulching kit (1989 and newer); requires 2 for 40" deckLength: 20 3/8 ", Center Hole: 13/16 ", Width: 2 3/4 ", Thickness: .134 "