the timeserts are solid material. the heli-coil's are not. the helicoil's are essentially what they're called-- a coil of heavy gauge wire rolled up... (kinda like a spring) and are more fragile, being made this way. While i haven't used the timeserts, they certainly do look like a better option, if your application will not be harmed by the extra flange at the top.... though it looks like by application, that thickness may vary. --- this is one of those YMMV posts like oil, tires, gas, etc etc![]()