Jeweler's 3" Brass Vernier Caliper - SAE & Metric Precision measuring instrument for delicate items - essential tool for jewelers Solid brass is non-magnetic, non-rusting and more gentle than hardened steel calipers Scale marked in millimeters bottom and 1/16" on top; 3/4" jaw throat Permanent plate helps prevent dropping small pieces Length overall 3-3/4", 5/8"W, 1.4 oz; also available in 4" and 2"