Ergonomic: can be placed, tightened and removed using only one hand. Simple to use: automatically adjusts to the size of the pipe. Fast: spring creates a ratchet effect. Efficient: extra-strong 3-point grip. Strong: Heavy Duty cast iron handle. For a fast, automatic clamping action: the greater the force applied to the wrench, the harder the jaws grip the pipe. Can also be used for tightening and loosening nuts.