TIMY1037 Features: * 44 ellipses 35° - 16" projection * Dimensions are for isometric axes * Inch equivalents are given in small type * Half of the 45mm ellipse is surrounded with pinholes spaced at every 15 isometric degrees * Lifetime precision centering pinholes are provided for major, minor and isometric axes * Major axes 1 to 45mm * Made in USA