Sturdy plastic hexagon-shaped roller marks line increments of 3mm, 5mm, 7mm, 10mm, 15mm and 20mm in clay. Works ideally with clay. Set includes a 6-inch stainless steel ruler that measures both inches and centimeters/millimeters. Ruler and roller packaged in a black/clear plastic case.
Rulers>H20-3520TL>Tools>Jewelers Tools>Measuring Tools>Rulershttp://www.firemountaingems.com/itemdetails/h203520tlH203520TLRuler and roller set, plastic and stainless steel, silver and grey, 6-1/4 x 1-inch hexagon roller and 6-inch ruler. Sold per set.//image1.fmgstatic.com/images/p3520tlb.jpg5.695.69As Low As $2.35 per set