The ATLIN Bicycle Spoke Wrench is a must have tool for building, repairing, or truing your cycling wheels. This spoke wrench makes adjusting the tension of the spokes on your bicycle rim a breeze. It is made of durable steel, and is very small and lightweight, so it can easily be carried with you or on your bike. The wrench is 40mm (1.57 inches) in diameter, and weighs in at just 1.7 ounces. This tool packs all of the common nipple sizes into just one wrench. The spoke key will fit over spoke gauges of 15, 14, 13, 12, 11, and 10. The wrench is designed to adjust and tension spoke nipple sizes of 3.23mm, 3.30mm, 3.45mm, 3.96mm, 4.40mm, and 5.00mm. The SAE equivalent of these sizes are as follows: .127 inches, .130 inches, .136 inches, .156 inches, .173 inches, and .197 inches.