You get what you pay for. These are none other than Ancor brand naval terminals. I thought they couldn't be that bad but they are. The lugs are flimsy and bend easily, heat shrinkage is questionable at best. Also, the most important thing is that the area where the wire is crimped is very small and the wire is almost not held on to anything. I wouldn't attribute anything to that. I used a couple of clamps on my engine wiring harness but I will remove them and replace them with matching Ancor brand clamps. Yesterday I threw a box of these inferior terminals straight into the trash can. These cheap fakes have no place in my life.