rim life is extended by tightening all the spokes with the same torque value 10 interchangeable heads with 12 x 9 mm square drive, suitable for the most popular spoke sizes: 5.1 - 5.8 - 6.1 - 6.3 - 6.4 - 6.5 - 6.7 - 6.9 mm ratchet head: 6.3 mm (1/4"), 24-tooth, for sockets with quick release button torque range: 3 - 15 Nm spoke torque wrench , length: 195 mm, Weight: 2.0282528104 pounds, Manufacturer: BGS