Item Type: Plastic Cutter Blades Material: Plastic Product Size: Approx. 20 x 83mm / 0.8 x 3.3in Small Hole Diameter: Approx. 7mm / 0.3in Large Hole Diameter: Approx. 12mm / 0.5in 1These blades are gourd shape, with glossy edges and wear?resistant, easy to install and use. 2Made of excellent plastic material, waterproof and durable, suitable for outdoor trimming work. 3The kit contains 100 plastic blades, which are sufficient for easy replacement at any time. 4These mower cutter blades will help make trimming more accurate as well as providing safety when pruning. 5The blade has standard size and is not easy to fall off, which is very suitable for household lawn mowers.The error of manual measurement is 2mm.100 x Plastic Cutter Blades