Do Finger Locks and Wrist Locks work for self defence? Everyone is starting to learn arm bars, leg locks, and triangles in jiujitsu and MMA. However, when it comes to street tactics, can you use finger and wrist locks? They are not easy to pull off, but Professor James Hundon shows the proper way to execute a finger lock and a wrist lock, which he learned from his teacher, Professor Wally Jay.