ALL THE TOOLS YOU NEED IN ONE SET – Get your math problems done with a set that has it all. THE ONLY COMPASS YOU'LL EVER NEED TO BUY – This sturdy metal compass will last as long as it takes ALL THE RULERS FOR MATH – A 12 inch Straight Ruler, two Set Squares and an 180° Protractor. GOOD GRADES IN MATH – depends on having the right tools and all the tools you need. GET THE JOB DONE THE FIRST TIME - This School Compass for kids can make a 10 inch circle, always.