Pillar files are rectangular cross cut files. They're thicker (relative to their width) than other flat files and have a cut surface only on top and bottom (not sides). They taper in thickness (thicker at tang and thinner at end). Available in 5 different types of width and edge, cross cut.

Checkering files are parallel in width and gently tapered in thickness. Overcut is parallel to the file edges and upcut is 90° to overcut. Useful for putting serrations on knife edges and to obtain a checkered design similar to a gun handgrip.