all rods on this page are 4" long rods have the rod number written on each rod you can zoom in on the picture to see rod number if a rod number does not appear in the drop down menu, it is sold out #1-#61 are 20mm diameter #62-#105 are 22mm diameter #106-#134 are 24mm diameter #135-#139 are 26mm diameter #140-#143 are 28mm diameter #144-#146 are 30mm diameter