Review on Mophorn 2 Pcs Tire Lock Clamp Boot - Heavy-duty Anti-Theft Parking Boot for Car Wheels - Parking Tire Claw Lock (2 pc) by Jason Camarillo

As some others have pointed out, once figured out they're not that difficult to fix. However, they come with no installation instructions or advice. I ordered two packs to protect a cargo trailer. Another thing I don't care is that the two packs are for two left tires, not left and right. The open/close tool is difficult to insert at the user's angle and does not hold well, requiring frequent re-insertion.