2 ways pressure are applied at table-level and the top of your fence. Ideal to do edge routing or table saw cutting. Special designed expandable miter track bars will hold feather boards firmly. A good company to work on table saws, router tables, drill presses or any tool with a standard miter slot. Features: Two easy locking knobs that safely position featherboard in place. Expandable miter track bars provide maximum holding power. Snug hold allows for safer, cleaner cuts when ripping, routing and drilling.