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The Pro Sect quarter scale with integrated protractor. The simplest, easiest to use and most accurate quarter scale to layout balls. The Pro Sect features a labeled 180 degree protractor to indicate degree of angle for oval hole cuts and oval thumb insert installation and an easy to read ruler designed in 1/16" increments spanning the diameter of a bowling ball. Its intersection-molded design maximizes durability and assures the accurate layout of straight and perpendicular lines.