Double wrench for the faucet aerator (perlator):M24x1 AG (external thread) for the water faucetM28x1 AG (external thread) for the faucet of the bathtubhttps://en.wikipedia.org/wiki/Faucet_aeratorPrinted with PLA: no problems with the strength and no scratches from the wrench German key words: Peraltor Schlüssel, PerlstrahlreglerYou can try with a lower infill but I recommend 100% Printed with PLAResolution: 0,1-0,3 mmM24: 24 mm inner diameter, 22 mm width across flats M28: 26 mm inner diameter, 26 mm width across flats But I added 0,5 mm to the dimensions for the play and shrinking of the material Designed with freeCAD http://www.freecadweb.org/