Great door. The plate for the roller hardware comes installed which simplifies things unless like me, you wanted to install different rollers.  The side sections of the six panel door are hollow except for a support section installed for the purpose of attaching the plate the roller attaches to.  Have to be creative to install a support piece that enables me to shift the holes the half inch for more ornate hardware.  If you intend to use the hardware supplied this is a great purchase for you that should be installed somewhat easily.  The only holes you will need to drill in the door are fir the handles.