Posi-Lock Advantages:

1) Rolled center bolt threads are designed for less effort when applying high torque.

2) Heat-Treated Tip

3) T-handle locks jaws precisely where you set them

4) Slim Tapered jaws allow for better gripping and easier access in tight spots

5) Safety Cage guides jaws for fast set-up, solid contact superior safety

6) Nut recessed to avoid mushrooming and disfiguring from impact

7) Leverage up front for positive grip, vise-like power and no slippage