PT430 PRO-LINE Trim Tool, 25 mm (1 in) Square at 45 Degrees

PT430 is the 25 mm (1 in) square set at 45 degrees in Kemper's PRO-LINE range. PRO-LINE tools pair a select hardwood handle with a loop of knife-quality high carbon steel that has been heat treated and quenched in oil. Carbon steel takes a sharper edge than stainless and holds it longer, even in heavily grogged clay or plaster, but it will rust if it is put away wet. The loop is held by a brass ferrule set in industrial adhesive and the handle is sealed in an oil-resin bath to keep water out. The 25 mm (1 in) head decides how much you take per pass and how tight a curve it will follow. Dry it after use and give the blade and handle a light oil now and then. It can be resharpened on an oil or water stone. Keep it off a power grinder, which would draw the temper.