As DoubleO said, the teeth and the pins are 156 size. I replaced the old rounded ones on my T9 bucket with new Hensley style teeth shortly after I got the machine. Made quite a difference when digging. The 156 pins used for the Hensley teeth are: DIAMETER: .375″ - LENGTH: 2.0″ . If you are going to try and drive the pins out, I recommend getting the correct size roll pin punch. It makes removal much easier.