Cut plastic Rev-A-Shelf drawer inserts such as Spice Organizer by scoring along the area you wish to cut with a razor blade. After making several score marks, cut through the plastic and discard the excess piece.
Cut the knife block by turning it over and unscrewing and removing any unnecessary knife holders. Remove the front divider as well. Draw a straight line at the point where you need to cut and trim with a table saw. Mark and trip the front divider separately and screw back into place before inserting in the drawer.
Cut vinyl Rev-A-Shelf inserts such as the peg board with a table saw. Discard any pieces removed, brush off any dust from the cutting process and stick into your drawer.