The 400 heavy-duty base is useful for projects that need added holding power like work on alternators, carburetors, etc.
106-001 - 301 Standard PanaVise
The original PanaVise is known around the world as a work holding tool for hobbies, electronics, small home repairs and work bench environments!
106-201 - PanaVise Junior
Perfect for arts and crafts, jewelry and model making, electronics, and other small projects! Your work is held gently, but securely, and can be positioned exactly where you want it.
I have dealt with MCM Electronics a number of times and have been more than satisfied.