The 3" screwdriver style hex driver is our most popular tool, useful for most situations. 
7/64" is used for all Split Jaw Clamps except for Wheel Stops, Transition, Adapter, and Mini Clamps.

All our clamps are held together with socket screws requiring a hex driver. For your convenience, you can order a high quality hex driver of the correct size. They work great and keep you from over-tightening the screws.