Ring Size OD (mm) H (mm) L1 (mm) L (mm) #12 19.7 12.2 23.6 #16 26.2 14.0 28.3 #20 33.5 16.0 35.0 #25 44.0 19.0 42.9 #30 60.5 20.5 53.8Fuji's K-Series™ Tangle-Free Single-Foot Spinning Rod Guides were released in 2010 and have set a new standard for tangle-free durability and light weight. Available in a wide range of sizes for light and medium action inshore saltwater spinning rods.