For precise measuring used in Jewellery to measure Rings, Metal Rods, Sheet Metal, etc. This Boley gauge is marked in millimetre gauge with capacity of 100 mm and useful Vernier reading to Tenth of millimetres 0.1 mm. Cut Out Jaws for measuring different Shapes. Equipped with Locking Lever. Made of Anti-magnetic Stainless Steel. Size 6" - 150mm.