This MicroTight Nut is designed specifically to work with NanoPort and MicroTight Unions, Adapters and Inline MicroFilters. It is manufactured from biocompatible PEEK with offers excellent chemical resistance. It has a 6-32 Coned port configuration and is for use with 1/32 tubing OD. It comes in headless and standard knurl head styles, natural and red color and comes in 10 packs of Headless and Standard red.