This Rod Ruler makes measuring 5/16”, 3/8”, 7/16”, 1/2”, 5/8” and 3/4” tubes with rod ends quick and easy. Ideal for pre-setting all your tie rods and trailing arm lengths on the bench and for pre-setting your spares ahead of time. Stepped boss automati-cally aligns the rod ends on center, large easy to read scale with pointer for accurate measuring. Measures up to 36” long.