Oregon 10" Edger Blade for McLane Edger (40-503) Made with high carbon steel, Oregon Edger blades are heat treated for maximum life and extended durability that will resist bending or breaking on the job. Features: Center hole: 1/2" Sharpened on 4 sides, straight cut edge Resists ...Oregon 10" Edger Blade for McLane Edger (40-503) Made with high carbon steel, Oregon Edger blades are heat treated for maximum life and extended durability that will resist bending or breaking on the job. Features: Center hole: 1/2" Sharpened on 4 sides, straight cut edge Resists bending, breaking and fracturing Heat treated for maximum durability and life Replacement for major brand: Tanaka