These drivers were originally designed for those who were racing on asphalt. These are non-extrovert drivers they are designed to drive off of the four row's of drive bumps found in between the track suspension rails. If your are purchasing for 1 snowmobile, you will need to order 2. These do not have antiratchet points. If you have a Skidoo and your driveshaft is prior to the Steel Splined shaft please refer to our Hex Shaft Drivers.
You will need an install tool to press these on to the shaft.