The Hamilton Flanging Tool Kit was designed to make precise flanges on 12, 18, and 22 AWG FEP (Fluorinated Ethylene-Propylene) tubing. The Flanging Tool Kit may not be suitable for other types of tubing or tubing with different outer or inner diameters. For best results, use only Hamilton premium quality CTFE (chlorotrifluorethylene) fittings, FEP tubing, and washers.