The Omni-Nut combines function of hex nut, washer and nut-cap all into one piece. The ideal solution for rimless assembly and repair.  If you can not find what you are looking for, please contact a sales  representative for top-of-the-line assistance *Illustrations may vary  slightly from actual product. Size: (1.20 mm Inner Dia. 2.5/3.4 Outer Dia). 
Unit: Package of 50 Omni Nut