Brass Sliding Millimeter Gauge Tool Gem Bead Size 86mm. This is a new brass sliding measuring gauge. It has a smooth brushed finish and fine, crisply stamped numbers and lines. Measures millimeters and inches. Graduated in 1 mm and 1/16" increments. Measures up to 86 mm and 3 5/16". We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.