High quality knives do mowing robots made of stainless steel reinforced-coated with a layer of titanium. The package contains (all packed in a plastic box )Material blades reinforced thickness 1 mm coated with titanium very high corrosion resistance excellent polishability, good extendability in a balanced state, high hardness, good wear resistance, compliance with Japanese industry standard. 30x knife 30x mounting screw The knives are made of SUS420J2 stainless steel with high hardening hardness. Compared to other substitutes, the steel from which the blades are made distinguishes: Dimensions: 36x18 mm Thickness: 1 mm Center bore diameter: 7 mm Screw caliber: 4 mm Japanese quality! BRANDS AND MODELS WORX PARKSIDE: PARKSIDE PMRA 20-Li A1 20V 500m2 2Ah PARKSIDE PMRA 20-Li A1 20V 500m2 4Ah PARKSIDE PMRA 20-Li A1 20V 500m2 PARKSIDE PMRA 20-Li 20V 1000m2 PARKSIDE PMRDA 20-Li 1000 m2 PARKSIDE PMRDA 20-Li 20V 4 Ah 1000m2 PARKSIDE X 20 V Team TITANIUM KNIVES DO MOWING ROBOT PARKSIDE PMRA 20 Li A1 20V The edges of the blade. High strength,Abrasion resistance advantages,Carefully made blades Blades stay sharp,Fast cutting Material: SUS 420 j 2 titanium Long lifespan of the mower Longer lifespan of the mower, Corrosion and rust resistance Galvanized screws. Galvanized Stainless Steel Screws, Rust and Wear Resistance and Color Durability