Features: -Universal head that fits most gasoline lawn mower and trimmers. -The head is made of high quality metal material, strong and durable for a long service life. -Manganese steel chain is high hardness, sharper and more durable. -Easy to install and convenient to use. -Perfect for use in the garden or farming. Specification: Color: orange Material: manganese steel Total length: 33cm Diameter: 9cm Height: 6cm Mounting hole diameter: 25.4mm Mounting: screw M10x1.25 with left-hand thread Maximum speed: 10,000 rpm Package Included: 1x Chain head .