The new revolutionary JessEm Paralign Feather Boards allows for quick and easy parallel height settings, while staying securely positioned in one place. The unique stackable feature allows for quick and easy height adjustment for larger or thicker work pieces. Paralign Feather Boards can be mounted horizontally on flat surfaces or vertically in t-slots. Paralign feather boards can be used on table saws, band saws, router tables, and shapers.