Without a doubt the best tire clamp I have ever used for Schrader valves. It locks and closes effortlessly and opens intuitively and easily. I bought them after trying the Haltec H-5265 lock on a pneumatic chuck that didn't work for me (wouldn't lock, didn't lock well and was difficult to remove). I chose the angled L2 to inflate my bike tires and it was a good choice. Works great with my car's tires, trailer etc. I think one of the reasons it works so well is the swivel which does not allow for hose or inflation torque to pull the chuck out.