This is a used item that has been used several times, so it shows some signs of use. There is no instruction manual. Gauge for checking and correcting the distortion of the derailleur hanger (base). The most common cause of shifting problems is the distortion of this derailleur hanger. Compatible with thru-axle type frame ends. Attach this tool to the screw hole where the derailleur is attached, rotate the gauge, and correct it so that the distance between the gauge and the rim side of the wheel is even at multiple points. Made in USA JAN code 4962772175194 - Brand: Park Tool - Model: DAG-2.2 - Type: Bicycle measuring tool Shipping and listing fees are the responsibility of the seller, so we do not accept price negotiations. Thank you for viewing.