This compass performs all the standard functions of a traditional compass quickly, easily, and accurately without having to use any dangerous points. The SAFE-T compass helps you draw circles 1/4" to 10" diamter in 1/16" radius increments. Direct view of vertex points allows for easier and more accurate constructions. Straight edge sides are calibrated with inch and metric rules. Made of SAFE-T plastic this compass is durable and shatter resistant.