Standard combo squares work poorly on round edges because they’re narrow and don’t have much landing. The head of the LaSquare is 2 inches wide, allowing for solid purchase on the edges of pipes, tubular steel, bullnosed trim, and the like. Made with an aluminum head and a stainless steel blade, the tool is available with either a standard ruler or a machinist’s ruler, in a variety of lengths. It was designed by a metal fabricator in Missouri and is made in the U.S. ¦ Price: Starting at $35. 573-436-1436. lagesseproducts.com.