Pretty good, this is my first time using one of these locks. That's where you would use the locking tab on the end of the lock to set the blades on the lawnmower. It has a square end with a recessed locking lever with a small screw holding it in place. As I said, this is my first time using this type of lock, as far as I know all problems are solved in this way. I'm sure this will hold someone back until they really want to laugh. I think I'll buy another one, the lock works well in my opinion and looks good for my application. The second will help even more to keep someone away. One on each side.