TENSION WRENCH The Tension Wrench applies tension to the lock as you rake and pick the lock. The importance of tension cannot be stressed enough... If there is too much, the pins will not be able to set correctly, and the same will happen if there is not enough tension. From the options select the following: Straight - you can bend it how you you want it! You may prefer applying tension at the top of keyway (TOK) or bottom of keyway (BOK). Bend - this tension wrench will have a 90-degree bend for carry inside the Plan B, EBUTOG and our High Tensile Stainless Steel safety Pin. Bend and Rotate - this tension wrench has a 90-degree bend and has been rotated to lay flat for carry on the APEK. Corrosion resistant 304 Full Hard Stainless Steel that differs from other forms of 304 in that it has been hard cold rolled to its full hard condition. This increases its fatigue life. In its full hard condition, type 304 stainless steel has a tensile strength of 185,000 PSI minimum, and a minimum yield strength of 140,000 PSI.