I recently purchased a Jet 14 inch closed base bandsaw.  It works great.  Before I ordered any blades for it, I decided to get the Riser block first.  The Riser block increases your cutting height from 6 to 12 inches.  Your  band saw blade size will then go from 93 1/2 inches to 105 inches.  If you  need this, get it before you buy any blades because your old blades will be  too short.  This is not an item that you can take off at any time.  It is a  permanent option.  The Riser Block was very easy to install.  You remove  the big bolt that holds the top wheel support the the bottom and add the  Riser block and use the new bolt to secure it.  The kit comes with a metal  rear blade guard.  The one that came with my saw was plastic.  The only  tricky part was lifting off the upper wheel and reattaching it.  Since it  is fastened at the back, it wanted to tip forward.  With me Riser  installed, I can resaw fire wood and thick beams into boards.  Think of all  the flavors of wood you can now use for projects.