AMACO-PolyRuler. The only ruler designed for polymer clay artists. This six-sided ruler will ensure perfect and uniform beads and strips anytime! Use it to mark and make uniformed beads; graduated beads; tube beads; chevrons; strips and more! The hexagon design allows for six measuring increments: 3mm; 5mm; 7mm; 10mm; 15mm; 20mm. Use it to make uniformed beads; graduated beads; tube beads; chevron beads and strips. This package contains one durable plastic PolyRuler that measures 6-1/2x1x1in. Made in USA.