1. MaterialThis Trimmer compatiblement Blades is made of stainless steel, which is stronger and more durable than ordinary plastic, the blade is finely crafted and the smooth edge ensures safety. 2. Size The cordless trimmer blades are 84mm long, 20mm wide, 12mm diameter compatible the large hole and 7mm diameter compatible the small hole. 3. Applicable This cordless lawn mower blade is suitable compatible most lawn mowers in the market, FRT18A, FRT18A1, Art 46155, FRT20A1, IART 2520 & IAT 20-1M, etc. (Compatibility is compatible reference only, please compare the size carefully becompatiblee purchasing.) 4. Easy to Install These lawn mower accessory blades are easy to install and use, no additional tools are required, and they can be quickly compatibled in a few simple steps, allowing you to mow your lawn, garden and patio with ease. 5. Package The package includes 10 pieces of lawn mower blades, enough compatible you to use and compatible. High quality blades make cutting easy