These robust little tools are designed to extend/ finish the kerf in half blind dovetails much the same as the old card scraper method. They are a lot easier to hold and are certainly easeir on the wood mallet you use to tap them. I designed these to be tapped on the top of the brass with a wood mallet or on the back similar to a chisel depending on your work methods. I offer three different plate thicknesses to choose from. 0.025", 0.020", and 0.015" as well as several different wood species, including Walnut, Cherry, White Oak, Infused Tiger Maple, and a few of my private stock, one off species. You'll have to ask to see those. Starting at $110.00.