??Life time?? Double Sided Blade! When one side gets dull, flip it around then use other side,two holes! 4 times lifetime ! ??Special process ??Titanium carbide coating are 100% break-proof thanks to a special hardening process.good wear resistance and durability. ??INSTALL?? Make sure the battery taken out ,put on gloves for safety, unscrew the old blade and switch it out screw, then screw the new blades and screws back in. ??Work well??The blades work well with Robotic Mowers . As a manufacturer in the field of garden technology, we specialize in spare parts and accessories for robotic lawn mowers! ??Security??Thanks to the good quality material, these blades are enduranced. Even if the blade encounters resistance (stones or similar) -safe storage box of extra blades when not in use. ideal for the safety of animals and children!High quality titanium lawnmower replacement blade Make the messy lawn look new! It is made of high quality stainless steel with a titanium c