You will want all three Kerf-Starters if you use a variety of saws. They remove shavings the same way other scrapers remove shavings, leaving a shallow kerf that captures your saw. Use the Kerf-Starter with a square to layout square lines across end grain and with the long grain. You may also use it to layout one part of a joint from another as in laying out dovetail pins from already cut tails (offset the tail piece to keep the kerf in the waste……see our Offset-Gauge). Prepare the Kerf-Starter the same way you would prepare any other scraper, filing and then burnishing the point (see our combination Scraper File-Burnisher).