Description:The Sette Torx ST-659A 40mm Headset Wrench is the common size for the 1-1/4 threaded headset standard. The opening of the Torx ST-659A is laser cut to ensure a tight, accurate fit while the tool itself is constructed of hardened chromoly. For convenience the wrench is clearly marked with the sizing in mm as well as having a hole for hanging the wrench when it is not in use. The Torx ST-659A also has a durable non-slip handle to give the best grip when applying high amounts of torque.