Twister T2 Nitrided Reel Blade with NutsNitrided blades are high carbon, hardened steel blades that surpass the quality and durability of most standard blades on trimmers. Nitrided Blades are FoodSafe; the materials used are approved for contact with food products. Hardened steel Increased tensile strength Increased corrosion resistance (no rust) Increased wear resistance Less wear on blades Less buildup on the blades Blades stay sharp longer Materials are approved for contact with food