30 Nut and Bolt Thread Sizes: Our nut and bolt thread checker instantly identifies 30 distinct sizes, covering Metric thread sizes from M3 x 0.5 to M14 x 2.0, and Imperial threads from #4 - 40 Coarse to 1/2 - 20 Fine MUST HAVE THREAD CHECKER TOOL: This thread checker gauge is an indispensable tool and gift option for professionals. Its one-piece design ensures that all parts remain securely organised on the tool, eliminating the worry of misplaced or tangled parts. Multi-Function Inspection: 30 Nut and Bolt Thread Checker instantly identifies 30 different sizes, including metric thread sizes from M4 x 0., 7 to M16 x 2., 0, and inch thread sizes from #6 - 32 Coarse Thread to 1/2 - 20 Fine Thread. Thread Checker Standard And Metric Thread Checker Gauge Tool, 30 Also adds 8 new drill holes (14mm /1/2inch/12mm/10mm/8mm/1/4inch/6mm/4mm) for more comprehensive measurements, and a 15CM and 6-INCH scale on each side for convenience. 30 Nut and Bolt Thread Checker instantly identifies 30 different sizes Thread Pitch Gauge Nut And Bolt Identifier 30-Piece Thread Checker - Metric & Standard Nut/Bolt Size Gauge With 15CM & 6-Inch Scale 30 Size Nut Bolt Thread Checker Standard Metric Gauge Bolt Thread Checker Tool