Review on Titan Tools 42157 Locking Reducing by Maya Rico

This is a GREAT value! They are a combination of a pendulum/universal joint and a drive size adapter. The center pushes and fixes the device (as shown in the picture) and they become standard fixed-size adapters. But you can also pull out the middle to unlock the device and it becomes a gimbal-sized adapter. That's cool! Because of the U-joint, they are about the same size as a swivel U-joint, which also makes them slightly larger than standard-sized adapters.