Centre Finder Square 1-1/2" 38mm Measures Bar UP TO 3" Diameter TOOL Go to amazon.com Related posts Check expert advices for layout tools machinist? DescriptionPRODUCT DESCRIPTION TOOL QUALITY STEEL, BLADE HARDENED AND TEMPERED, DESIGNED FOR FAST AND ACCURATE LOCATION OF THE CENTER OF THE FACE OF A ROUND BAR UP 3" DIAMETER, USEFUL SQUARE FOR THE MACHINIST"S AND TOOL MAKERS