Why this combination? The 2" jaws are a given (they come with the chuck!). 1" dovetails jaw are extremely useful for small turnings (Christmas tree ornaments etc). The Cole Jaws are our most popular selling jaw - designed for refinishing the bottom of a bowl up to 10". The 45mm Spigot jaws (my personal favorite) are just the ticket for long unsupported (i.e. no tail stock) spindle work - goblets, candle holders, etc. This is a great starter package - these are probably jaws you will buy eventually - buy them with the chuck and save!