Specifications:
Type: Gearbox gearhead
Specification of bolt for fixing grass head: M10 * 1.25mm reverse thread
Spline: 9 teeth, 7 teeth, 4 teeth (Square 5.3mm*5.3mm)
Connector Diameter: 26mm and 28mm
Color: As picture shows
Fits for: most of gasoline brush cutter machine

Package includes (one of them):
a. Gearbox 26mm-9T
b. Gearbox 28mm-9T
c. Gearbox 26mm-7T
d. Gearbox 28mm-7T
e. Gearbox 26mm-4T(Square)
f. Gearbox 28mm-4T(Square)

Note: 
1. Please allow minor errors due to manual measurement. Thanks for your understanding. 
2. Monitors are not calibrated same, item colour displayed in photos may be showing slightly different from the real object. Please take the real one as standard.