Solid Metal Screw Bolt Caliper - Stainless Steel Nut Screw Gauge With Screw Alignment Function, Sturdy And Durable Construction, M1-M12 Precision Measurement, No Assembly Required. Ideal For Repair Technicians And Mechanics In Electronics And Automotive Manufacturing Industries, DIY Projects, And Auto Repair Shops. This Convenient Portable Measuring Tool Provides Accurate Measurement Results. Also An Ideal Gift For Men!