The carbide tipped blades are made of high carbon steel and carbide tips. They probably fit any garden trimmer, brush cutter, weed eater that comes with 1" (25.4mm) or 7/8" (20mm) arbor hole. Please refer to the owner’s manual of your trimmer / brush cutter / week eater and our product description to determine whether our blades will fit your tools. Always be sure that the blades are installed securely. Always equip youself with helmet, long boots, safety goggles and other safety gear during working.