The Proloc™ Blocker is great if you have to store gear in a public gym.  The Blocker locks one end of the bar which renders the bar useless.  Use a chain to secure your bar to a fixed object.  You can also use it on weight trees if you don't want anyone using your plates.

Specifications

• Fits any bar with collars ranging from 1.937" to 2.007" (Fits most bars, Fits all olympic bars)
• Made in America
• ONE Collar is included
• Lock NOT included
• Comes with an allen key that is stored within the collar
• Package Dimensions (LxWxH): 5.3" x 5" x 2"
  

Warranty

Each Proloc™ Collar comes with a 2-year warranty covering material defects and workmanship. Warranty does not cover disassembly of threaded knob and incorrect replacement resulting in cross-threading