What's in the box:

MTB Mountain Bike Bicycle Derailleur Hanger Alignment Gauge Tool (Standard)

Features:
Made of heavy-gauge stainless steel for stiffness and durability, high temperature resistance up to 800?.
Fits most frame/hanger combos including low clearance thru-axle derailleur hangers.
Used to correct the rear lifting lug and to check the transmission shifting problems.

Specifications:
Material: Stainless steel
Size: 36.5 * 16.3cm / 14.4 * 6.4in
Weight: 870g / 1.9lb
Package Size: 43 * 9 * 7cm / 16.9 * 3.5 * 2.8in
Package Weight: 918g / 2.0lb

Package List:
1 * Derailleur HangerAlignment Gauge