One of the nicest edits to do in wood is thread caressing. Someone here is a master in Jan Hoven. He makes these chisels in his own management. They are consistently high in quality. The handles are of Robinia and finished with oil. This is the set of chisels with 3.5 mm increase. For example, you could make a thread M33 with it. The thread stroking is a concentrated piece of work, but also addictive! Use preferably wood with a fine grain and preferably cross winded. For wood species with an open structure, stroking is less good. Most suitable are hedge and stone beech, Cocobol0, mahogany, Makore, olive wood, ebony, Taxus. Sharpening these chisels goes with a CBN or diamond file. Click here. Should the wood break out (because the structure is not so good, or the wood type is less suitable) you can impregnate the wood in advance with oil. Turn the wood on thickness, start stroking, stop halfway and Impregnation B.V. With this oil. Check here to see if there is a course screw thread caressing planned.