Westcott See Through Acrylic Ruler, 18", Clear Durable, flexible acrylic rulers with beveled edges are accurately scaled in 1.16" on one edge and millimeters on the other Plumb-Line end serves as a T-square Sold as each Durable, flexible acrylic rulers with beveled edges are accurately scaled in 1.16" on one edge and millimeters on the other. Plumb-Line end serves as a T-square. Sold as each