1. The mower blade is made of stainless steel spring steel, thickness 1.5 mm 2. The metal mower blades are quick to install and require no tools. Replace ABS blades with these mower metal blades when you need to clear grass or weeds. 3. The replacement metal blades offer good stability 4. It effectively removes all unwanted weeds from your lawn or garden, keeping the mower running efficiently 5. Suitable model: for Stihl Polycut 2-2 mower FSA 45 6. A size: 85 x 20mm, individual weight: 15g 7. B size: 82 x 20mm, individual weight: 10g 8. Installation: snap the two cutting blades onto the mower and use when you hear a click