This tool is ideal for it's intended purpose, holding bicycle spindles so they do not turn, without damaging the spindle threads, being of a softer metal than that it is grasping, whilst being held safely in a normal workshop vice.
This vice also incorporates different vice spaces for different spindle shapes and sizes.
Cheaper copies don't have the ears. So if your vice has aluminium soft Jaws they don't work as the magnets don't stick..Then they are forever falling through when adjusting the vice.
Essential if you have use of a vice for bike repairs or general tinkering.