Wide Application: Compatible with Audi, BMW, Citroen, Fiat, GM, Mercedes, Mitsubishi, Renault, Seat, Skoda, Volvo, VW, UTV, ATV, etc. How to Use: Step 1: Slide the boot onto your arm,starting with the larger end and extending it towards the smaller end of the boot,Trial fit the boot onto the CV joint to ensure it slides on to the arm of the CV boot installation. Step 2: Repeatedly press the "+" button until the arm is sufficiently spread to pass over the joint. Keep your hands clear of any moving parts. Step 3: The air line can now be disconnected, while the arm will remain open until the minus button is pressed. Step 4: Reposition toll over CV joint and press the "." buttin to release. Keep hands clear of moving parts. Step 5: Slide the boot onto the shaft, Reconnect the air line and remove the tool from fitting and leave the boot in place to complete the installation.