Features:1. 203 Stainless steel and chrome finish, it combines high strength, good resilience, elegant appearance. Not easy to rust and long lasting durability.2. Accurately measures internal and external screw threads with thread blades of varied size;Use to provide the correct size drill bit, or to size fastener to determine what bit should to use. Used for checking tool angle while cutting threads in metal turning lathes, accurately measures internal and external screw threads with thread blades of varied size.3. The angles on the thread cutting tool is checked on the V slots in the gauge.4. Before purchasing, please confirm whether the measurement range of the product is suitable for the object you need to measure.