Material: Aluminum Alloy + Steel. Product Color: Silver. Diameter: 26mm. Teeth: 9. Package Contents: 1 x Gear Head Features: High Quality: The inner diameter of the housing is 26mm. The gearbox has a 10 x 1.25 left-hand male thread. Made of aluminum alloy + steel material, low density, high strength, strong conductivity. Universal lawn mower accessories, gear heads and a complete set of accessories. How to determine the product model (There are two steps) Step 1: Count the teeth in the counting tube or count the teeth of the shaft of transmission to confirm (7 teeth or 9 teeth) Step 2: Measure the inner diameter of the pipe or measure the diameter of the aluminum pipe to confirm (26 mm or 28 mm)