Oregon 595-085 PK3 Gator G5 Blades - 18" Pack of 3 Replaces: Dixon 10881, 510417801, 539117973 Replaces: Husqvarna 595-085, 510417801, 539112079, 521981501, 577240301 Length: 18"; Width: 3.00"; Thickness: 0.164"; Center hole: 5 pt. star; Air Lift: 1" Tungsten carbide is fused into the blade  creating an ultra-hard layer at the cutting edge and increasing the time between sharpening