Product Name: Bending Blade Size: 49.5*19*1mm Silver: 420J2 stainless steel Hardness: 52HRC Screw: Timing Screw Features: Rust-proof, non-fading and wear-resistant. Shipping Quantity: 15 pieces Product color: gold [Premium Quality] Made of high quality 420J2 stainless steel with titanium coating, excellent resistance to rust, antacids and alkalis, wear resistant and long lasting of life. [High cutting performance] Soft edge with 1mm thick, razor sharp, gently mow the lawn in all directions, only hold a little grass at a time, fertilize naturally the ground, keep the lawn clean, green and healthy [Titanium coating] Not only does it provide better protection against oxidation, but it also keeps the gas mower running with high efficiency even in unpleasant weather , as well as less sediment and long lasting. [Easy to change and reversible] Very easy to install and change with the screws (included), the end caps are double-sided, you can reverse from side to side. the other.