I'm a plier expert and have a set of genuine Dewitt, Nebraska Vise-Grip pliers to compare. On the other hand, I have come to the conclusion that YiYi Tool is a very good fake, although the manufacturer skipped the final finishing steps. There were raw splinters of metal in the teeth of the jaws, and nothing was oiled. When I first started working with this tool I found that a small amount of oil on the sharp threads of the screw made the job much smoother and the jaws got cleaner with use. Everything works as intended. The Sino-English guide explains the basic principle of using a screw to adjust the clamp hole size before clamping what you grip. This concept is usually clear to those familiar with such tools. Here's a summary for those unfamiliar with it (there's also a video on that): How to Use Locking Pliers1. Release the jaws by depressing the handle release lever attached to the handle. You can adjust how far the jaws stay open when the handles are together by turning the adjustment screw on the other handle.2. Place the jaws on the nut, bolt or other object you wish to grip, then close the jaws by turning this clamp adjustment screw. This step is to set the clip size.3. Lift the pliers away from the object, and then turn the nut an additional 1/2 turn or so that the jaw hole is slightly smaller than the object. This setting determines how tight you clamp.4. Press the pliers onto the object until the pliers click closed. Depending on how hard you set the jaws, you may crush and damage some items because the clamping force is so great. If you don't want to compress as much, loosen the adjustment screw. The wire cutters work just as well as the originals and are a crude triangle squeezing a flat block. The obvious intention is to cut objects like braided wire and then use locking jaws to hold the wire while it's being twisted. My electrical kit has the best wire cutters and wire strippers, but that's for a different purpose altogether. The YiYiTools version is a good tool for less than ten dollars. The current version of the well-known brand Irwin is also made in China, but it costs almost twice as much.