STAUFF thread identification boards type FI-TIB as a universal tool for workshops, warehouses or sales areas allows quick and easy determination of common thread types and sizes, e.g. for tube connectors and test couplings. For metric threads (M8x1 to M48x2) and Whitworth tube threads (G1/8 to G1 1/2), NPT threads (1/8-27 to 1 1/2-11.5 NPT),UNF threads (7/16-20 to 7/8-14 UNF) and 4 UN threads (1 1/16-12 to 1 7/8-12 UN).