3D chain ring for men . Ring size (Diameter) : 20.5 mm and you can ask me to resize it for you as you can have the 3.dm file of it :) Weight : silver (9.49 and 9.52 gr) Ring demension : 24.52 x 8.82 x 2.15 mm Available for all kind of 3D printers . already printed and tested in Form2 printer .