Features: 1. Made of quality aluminum alloy with CNC machining, sturdy and firm, durable and corrosion-resistant. 2. It is used to lengthen the rear dial chain, and apply to mountain flywheel 0T/ 42T/ 46T/ 50T highway flywheel. 3. Make the flywheel speed change more smoothly. 4. Easy to install and remove. 5. Great accessory for cycling enthusiasts. Specifications: Material: Aluminum Alloy Optional Color: Red, Black, Blue Total Length: Approx. 62 mm/ 2.44 inch Height: Approx. 23.5 mm/ 0.93 inch Thickness: Approx. 11.6 mm/ 0.46 inch Hole Distance: Approx. 40 mm/ 1.57 inch Weight: Approx. 31 g (Included screw) Packing List: 1 x Bike Rear Derailleur Hanger 1 x Screw
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